ATian 360' Rotary Backpack Hat Rec-Mounts Clip Fast Clamp Mount for GoPro Hero 2 3 3+ 4 Camera or SJ4000 Easily clip or remove it at the backpack,hat .etc. Material: ABS plastic Dimensions: 2.36 in x 1.57 in x 1.97 in (6 cm x 4 cm x 5 cm) Weight:2.12 oz (60 g Compatible withGopro HD Hero 2 3 3+