Action Camera Head Strap/belt Harness Mount + Aluminum Thumbscrew Mount for Gopro Hd Hero Type Cameras Sj4000 Type Action Camcorder, Adjustable (Black) 1+1 Waterproof head-strap camera mount that works with any GoPro camera including GoPro Hero, Hero 2, Hero 3, Hero3+, Hero 4, Hero 4 Black, Hero 4 Silver, Hero+ LCD, and Hero 4 Session One size fits all;Measures 6 to 7 inches in diameter; stretches to 12 inches in diameter fits directly on head or over most helmets Adjustable nylon straps with non-slip rubber inserts; polycarbonate buckles Ideal for hands-free filming when you want a point-of-view angle 2 Year Quality Guarantee:Replace a new one if have quality problem.