The Bike Tie is adjustable to mount on any handlebar diameter and enables you to fit any smartphone from 4.7'' to 7.2'' in size to your bars. The easy attach system will fit to anything that has a bar, not just handlebars. Simply attach and pull strap tight until desired size is chosen. The tight, non-slip silicon ensures your phone stays locked into the holder under movement. Silicone is also lightweight, dirt resistant and washable.