Mold-on rubber wheels have a vulcanized rubber tread molded to a heavy duty cast iron core, and they offer a shock absorbing, semi-cushioned ride. These wheels easily roll over small debris, rough floors, cracks, floor joints, etc. The cushioned wheels provide a quiet rolling operation, their soft tread won't harm your floor, and they also have an economical price. These wheels work well in outdoor environments, but the cast iron core can rust. If this is an issue, look at using aluminum or plastic core wheels. While they won't harm your floor, the black rubber may leave rubber marks. Other wheel options are available to prevent this.
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