Portable Threshold Ramp 3/5/6/7/8/9/10cm Height Non-Slip Surface Durable Ramp for Car Motorcycle Wheelchair Scooter Pets Access. It is made of high PVC material. Anti-skid: The car ramp is designed with an anti-skid texture on its surface to increase friction and prevent skid, allowing water to circulate and preventing rainwater from accumulating.