QuietKat wheels are very durable, roll easily, and are well suited to a variety of applications. These lightweight wheels cushion any ride over rough surfaces, providing excellent shock absorption. The soft 88A Durometer thermoplastic rubber tread will not mark floors and are designed to reject debris. QuietKat wheels are resistant to chemicals, water, and steam, and can withstand a variety of weather conditions. Thread guards are designed as a grease seal and are date stamped to assist you in evaluating wheel life.