The 15" No Marr Strap is highly adjustable allowing for the perfect length without the danger of violent recoil like other fastening devices. There is no cracking under outdoor use. The units are made with a UV resistant proprietary process which deters cracking, tearing or fraying unlike other fastening devices which deteriorate when exposed to the sunlight for long periods of time. No Marking - No Worries - The No Marr Straps are constructed out of a formulated plastic that does not mark or scratch. Great for Cars, Trucks, Boats ATV"s - Everything. Color Choices per box - Green, Black, Yellow, Blue, White, Red and Hunter Green. Also available in Military Green, Battleship Grey and Desert Sand.