Will not warp, crack, chip or rot. Withstands 120,000 lbs. Yellow polyurethane glass-beaded paint for maximum reflectivity. Channeled bottom (two 1-1/4” channels) allows for cabling or piping and facilitates drainage. Epoxy or rebar spikes can be used to hold speed bump in place. Four rebar spikes required on 72” speed bumps. Spikes sold separately. Made of 100% recycled rubber.