RWM Hard Rubber Wheels are used where low cost, easy rolling wheels are required. Hard Rubber Wheels offer good floor protection, are quieter than steel wheels, and are strong and chip resistant. Hard Rubber Wheels have a center line located in the middle of the tread. This center line, even when removed as close as possible, can cause damage to soft inexpensive floors. Hard Rubber Wheels can become brittle over time, and more so when exposed to outdoor elements. Hard Rubber Wheels can crack when dropped from limited heights or subjected to impact or shock.