Hundreds of mushroom-shaped stems interlock when the two sides are pressed together. Snap announces that the fastener is engaged. Product Features:Apply at temperatures above 50 degrees F (10 degrees C)Make sure surfaces are clean and dryDo not use on car mufflers, furnace exhaust tubes, or anywhere temperature exceeds 300 degrees F (149 degrees C)Great for toll passes and EZ passesCan hold cell phones steady when driving
