Ultralight Buoyancy Arms - Long

Regular price $147.50
Tax included.

Only 1 items in stock!

Ultralight's Buoyancy Arms come in various sizes. Large Buoyancy Double Ball Arm segments were designed for the heavy DSLR housings and video housing. They are 2" in diameter and constructed the same as the regular buoyancy arms.

They range in size from 8" to 16" in 2" increments to be able to add just the amount of buoyancy you need to offset the weight of the housing and strobes or lights.

Amount of buoyancy per arm length:

  • 8" (DB-BL08) 4.5 oz
  • 10" (DB-BL10) 8 oz
  • 12" (DB-BL12) 11 oz
  • 14" (DB-BL14) 14.8 oz
  • 16" (DB-BL16) 1 pound 2 oz.

Regular Double Ball Arms

Arm Sizes
Length Weight on Land* Weight in Water*
5 & 5 16" +13 oz. +8.5 oz.
5 & 8 19" +14 oz. +9.5 oz.
8 & 8 22" +15 oz. +10.5 oz.
8 & 12 26" +15.75 oz. +11 oz.
12 & 12 30" +16.5 oz. +11.5 oz.
12 & 16 34" +17 oz. +12 oz.
16 & 16 38" +18 oz. +12.25 oz.

Large 2" Diameter Buoyancy Arms 



Part number



 Weight  out of water  

Buoyancy in water



Weight out of water  

Buoyancy in water

DB-BL08 8" 6.8 oz. 4.5 oz. 203mm 195g 128g
DB-BL10 10" 7.7 oz 8 oz. 254mm 218g 227g
DB-BL12 12" 8.4 oz. 11 oz 305mm 238g 312g
DB-BL14 14" 9.1 oz. 14.8 356mm 259g 420g
DB-BL16 16" 9.8 oz 18 oz. 406mm 280g 510g

Use this table, if you are replacing arm segments you already own. Weigh your complete system in water with housing, arms, and strobes to determine its weight in water, then look in the table on the buoyancy column, to decide on which arm length(s) you need for the buoyancy you want.


Arm section lengths Length Weight out of water Buoyancy in water Length Weight out of water Buoyancy in water
8 & 8 22.75" 1 # 7.9 oz Neutral 577mm 676g Neutral
8 & 10 24.75" 1 # 8.7 oz. 2 oz. 628mm 698g 50g
10 & 10 26.75" 1 # 9.5 oz. 7 oz. 680mm 723g 198g
10 & 12 28.75" 1 # 10.2 oz. 8.3 oz 731mm 742g 235g
12 & 12 30.75" 1 # 11 oz 11.2 oz 780mm 762g 318g
12 & 14 32.75" 1 # 11.7 oz. 15 oz. 832mm 783g 425g
14 & 14 34.75" 1 # 12.4 oz. 1 # 3 oz. 884mm 804g 539g
14 & 16 36.75" 1 # 13.3 oz. 1 # 6 oz. 935mm 827g 624g
16 & 16 38.75" 1 # 13.9 oz 1 # 9 oz. 980mm 846g 709g

Use this table if you are replacing your complete arms or do not have any arms for your system.  Weigh in the water your housing and strobes and any other equipment you plan to use, then look in the table, buoyancy column, to decide on which arm set you want for the buoyancy you want.

Update 18/12/2020: There are some production delays at present that may increase wait times on items like housings. We apologise for the inconvenience. If there are any delays with your order, we will communicate this immediately.

Update October 2020: Delays with local couriers are common. For the latest updates on shipping, check out NZPOST's website here.

How long will it take for my order to arrive after I make payment?

That depends on where you live and whether we have an item in stock or not. While we do have many items in stock, we don't carry everything. If you need an item in a hurry, it's a good idea to contact us and find out if your item is in stock.

If we have it in stock, we can usually send it out as soon as we receive payment, or you can pick it up. If an item is not in stock, we'll need to order it from our suppliers, which means it can take 1-2 weeks to arrive at your door (usually closer to a week).

Sometimes delivery can take longer, if our manufacturers are out of stock, for example, but this is unusual - we let customers know as soon as possible if something like this happens.

How do you ship my orders?

We use New Zealand Post and CourierPost to ship orders. Our default is courier, though you may organise an alternative with us by contacting us directly. CourierPost aims for next day delivery nationwide between major towns and cities in the North Island. South Island delivery can take two days. If you require next-day delivery in South Island, choose the express shipping option for the South Island. If you spend over $250 get your shipping for free!


We hope you, your families and friends are safe and healthy during the current Covid-19 situation.

As you may know we are a small team at Sea Tech Ltd. Our team has zero close contact with people outside our bubble.

We wish to assure you, that when we begin fulfilling orders on 28 April, we will be following the government health guidelines surrounding safe operating procedures. Hygiene basics such as hand washing, coughing/sneezing protocols as well as the wearing of appropriate protective equipment such as face masks.

We are continuing to follow the regular updates to government health guidelines and initiatives regarding Covid-19.

Please do not hesitate to contact us if you wish to discuss any aspect of our delivery service via Courier Post New Zealand.

We wish you all the best during these challenging times.

When you buy something from us, the price is literally exactly what it says on the tin.

If you buy something from an overseas supplier, that is most definitely not the case. While the product might seem like a great deal on screen, it's important to understand customs and import costs.

In addition to the ticket price on an overseas purchase, whatever the exchange rate is on the day (this can fluctuate wildly - trust us, we know), there are also tariffs, GST and border processing fees. This can easily add upwards of 25% to the ticket price. Items costing over NZ$1000 also incur import entry transaction fees.

In addition to these extra costs, Customs clearance can also cause delays. Sea Tech has been importing for years - we've got this down to a fine art, and we've built relationships with customs that help our items clear quickly.

By buying from Sea Tech, you avoid all the headaches, delays and extra costs. We handle all this stuff for you, so you don't even have to think about it.

Want to know more?

These Nauticam housings are non-returnable, non-refundable, non-cancellable, and may be subject to extended lead times as they are manufactured on demand. We always do our best to meet trip deadlines so please advise us if you have a trip coming up!

Why choose Sea Tech?

We're Official in a world of cheap knock-offs

Sea Tech has built its reputation and business on knowing our stuff, giving you the best, whether that's advice or products, and helping out when you need a hand. Underwater photography can be tricky and expensive, so it's best to buy local and buy official.

Why Choose Sea Tech

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