Universal Powerbank HolderA Highly stretchable design fits various power banks (Perimeter 13cm - 18cm) Fashionly DesignX-Shaped Strap design allows you to place the power bank either horizontally or vertically and easily assemble or disassemble Mlti-Purpose UseCompatible with all of bike phone mounts from Bone Collection. (Bike Tie & Bike Tie Pro Series) Easy to CleanMade of premium silicone material, stain-resistant and washable