"The Park-It Parking Curbs help drivers safely park without causing damage to your property. These rubber curb ramps are 4"" high, and will not damage cars with lower front ends. They are flexible and conform to uneven surfaces, are safer and more durable than concrete or plastic curbs, and won't chip, crack, or fade. The Park-It comes with pre-drilled 3/4"" holes for permanent installation. Available in black and yellow and black and white, these curbs are highly visible even at night."