The Ocean and Earth Tie Downs make attaching your board to your car's roof racks easy. The tie downs are made from a durable webbing, measuring at 25mm wide. The Velcro loop allows for a secure lock down for the excess webbing. The tie downs come in a variety of lengths from 2.5m/8ft, 3.6m/12ft, and 4.8m/16ft. The instructions for how to use the tie downs is on the outside of the package.