Rec-mounts Extension Adapter for Gopro (Gp-gp-s75125) for GoPro HD HERO HERO2 HERO3 HERO3+ 75mm 125mm (GP-GP-S75125) Material resin. for indoor. use strap for prevention falling. It may become camera shake by the adapter facebook https://www.facebook.com/recmounts cycle catarog(PDF) http://www.an-y.com/img/rec-mount-catalog3.pdf