Antkeet Adjustment Curved Adhesive Helmet Front Side Mount kit for GoPro HD Hero 4 3+ 2 1 Vertical Surface J-hook Adhesive Mount Set for Gopro Hero 4 3 2 1 Material:Eco friendly plastic The Curved adhesive mounts can be cleanly removed when heat (e.g.. From a hairdryer) is applied The adhesive mounts are made with 3M adhesiv