Discount Ramps Guardian Modular Speed Bump - 47" Long Creates a safer driving environment for roads, parking lots, and more High visibility coloring with eight reflective beads for low light areas Mounting holes allow for permanent installation on asphalt or concrete (hardware sold separately) Manufactured from durable rubber with a skid-resistant surface Measures 4' L x 12" W x 2" H with 1-3/8" x 7/8" channels to protect cables Creates a safer driving environment for roads, parking lots, and more High visibility coloring with eight reflective beads for low light areas Mounting holes allow for permanent installation on asphalt or concrete (hardware sold separately) Manufactured from durable rubber with a skid-resistant surface 1-3/8&#034; x 7/8&#034; channels to protect cables