Amazon.com: Seafrogs Underwater Float Arm, Carbon Fiber Buoyancy Arm with Dual Ball Mounts for Photography and Video, Compatible with Diving Trays, Video Lights, and Strobes(D80mm/3.14'' H224.9mm/8.85'') : Electronics
8"/20.5cm D40mm Carbon Fiber Underwater Float Arm for Video Light/Stro – seafrogs
USED Nauticam 50x200mm Carbon Fiber Aluminum Float Arm Pair