ReFuel 2-Pack Battery for GoPro Hero4 This aluminum knuckle kit is

This aluminum knuckle kit is much stronger than the original plastic parts made by GoPro

and is recommended for heavier cameras or for applications where you will be adding a ball head or rotating arms

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Flip between any 2 filters on the same dive with the touch of a finger

ReFuel 2-Pack Battery for GoPro Hero4 This aluminum knuckle kit isReFuel's dual battery pack for the GoPro Hero4 Black and Silver Editions. Amazing run time on these replacement batteries for less money. You get two 90 minute rechargeable batteries that replaces the AHDBT 401 battery that comes standard. These batteries are 100% compatible with the GoPro Hero4 action cameras. Premium lithium ion cell battery.