Spine ramp 30 inches tall by 4 feet wide. Double steel coping, high quality locking casters. All pressure treated lumber frame and ACQ screws. Two layers of 3/8 inch pressure treated plywood sub face. Face layer is quarter inch good one side fir plywood. Transitions are same. Steel transitions can be substituted easily. This is a bomber ramp built well with all the right materials. Ready to ride.