Maintenance free. Extremely durable recycled rubber will not warp, crack, or rot. Withstands wide temperature extremes. Painted with polyurethane yellow reflective paint. Built in catseye reflectors for added visibility. Two 1.25” underside channels allow for cables & provide drainage. 48” speed bump requires 3 spikes. 72” speed bump requires 4 spikes. Good for weights up to 6000lbs.