Review on 🅿️ Professional Grade Rubber Parking Guide Blocks - Heavy Duty Wheel Stops for Car Garage Parks with Reflective Stripes - Ideal for Trucks, RVs, and Trailers - 2 Pack - 21.25"(L)x5.7"(W)x3.54"(H) by Ryan Koser

They are heavy and well made and there were two in the box. I left one for my husband's car and used the other for my car. My husband was skeptical that they would stay in place unless bolted to the cement floor. Well, they work, and it's easy to "feel" them when coasting after pulling into the garage. We had them for a few weeks and they didn't move at all. We love the fact that we no longer have to guess where to stay. The product is a bit more expensive but the quality and weight of the rubber makes it worth the price and the fact that they can be moved around without permanent installation makes them perfect for what we were looking for. Highly recommended.