The silicone strap is highly elastic and allows for easy installation and removal anywhere on your bike. You can install it on the front, back or anywhere else on the bike. Once it is attached, it clutches and stays firmly in place regardless of bumps and jolts. Each light contains 2 bright lights with 4 modes:steady-on, rapid flash, slow flash and off. You can conveniently switch between different modes as needed at anytime with a push of the button. Imprint Size: 4/5″w x 4/5″h, screen printed. We can rush service and the price includes shipping cost to ca. Variety color choice, custom logo is available. Send artwork and start your order today. Welcome you rush order. 100% guarantee for quality, We are GLAD to get SINGLE PIECE ORDER.