
Strong and light, compact foldable. We keep them in our jeep to use in our small trailer. But we were very glad they were on a recent trip when we didn't have our caravan with us. We found that our emergency brakes stopped working. Luckily we had these blocks with us and were able to use them when parking on steep roads in two national parks, remote New Mexico and Colorado, to keep the jeep from rolling until we fixed our emergency brakes.