I'm concerned about the dirt on the casters. Wiping the casters is stressful. I'm concerned about the noise of the casters while moving. I'm worried about the casters and the floor getting damaged. Removing the caster covers at the entrance eliminates the need to wipe the casters. Made of silicone, they can be washed thoroughly. Also, caster covers can reduce noise. Size: Fits wheels (casters) with a diameter of approximately 5 to 6.5 cm. Weight: Caster cover 1 piece: Approximately 4g Color: Black Quantity: 16 pieces (for 2 cases with double wheels) * Double wheel casters require 8 pieces per case. Material: Silicone Search terms: Dirt-resistant, suitcase caster cover, tire cover, travel, business trip, travel goods, rubber, carry case tire cover, wheel cover, silicone, wheel cover, carry bag wheel cover, scratch prevention, rolling prevention, luggage protection, luggage wheel cover, travel