In my 30+ years of working on aircraft I have used a variety of wood and plastic wheel chocks and this ribbed rubber chock has never failed like others. I have a larger pair for my cargo trailer and thought these smaller ones would be perfect to lock up a garage parked motorcycle/sidecar. I have one without a gearbox so if you forget to put the parking brake on you can easily roll into something expensive. Good size for cars and trucks, much safer than 2x4s.