ToolUSA (4 Pack) Black Round Plastic Cap for Metal Legs | 3/8" Diameter & Height | Protects Floors | Great for Chairs, Furniture, Items for Non-Marring Surfaces - Amazon.com
Everbilt 7/8 in. Black Rubber Leg Caps for Table, Chair, and Furniture Leg Floor Protection (4-Pack) 49127 - The Home Depot