COSMOS 360' Rotary Backpack Hat Rec-Mounts Clip Fast Clamp Mount for GoPro Hero 2 3 3+ 4 Camera+ATian band lanyard Easily clip or remove it at the backpack,hat .etc. Material: ABS plastic Dimensions:3.25Dimensions: 3.25" x 1.25" x 1" (L x W x H) Weight:1.9 oz Compatible with Gopro HD Hero 2 3 3+