They are designed not to cause any damage to vehicles. Rubber wheel stopper gives the driver a clear warning that their rear wheels are parked correctly. They are supplied with pre-drilled holes for concrete or asphalt installations.The wheel stoppers reduce the risk of accidental damage to columns, concrete pillars and lighting columns, etc. They are manufactured in Solid and Hollow types for a tough service life. The product absorbs impact and quickly recovers back to its original shape when the load is removed.They are cut to the exact size to suit your site requirements. The product can be delivered in an All Black with a Bright Yellow Strip rubber finish.