These tyre stops keep the aircraft securely parked. A pair of black molded plastic wheel stops are connected with 22 bright yellow and black braided nylon rope that wont rot or retain water. The bottom cleats keep aircraft securely parked, and the concave design fits any aircraft tyre. One pair is needed for each wheel.Dimensions: 7-3/4" x 2-1/2" x 4-1/2".