TruGuard, 8 Pack, 4-1/2"-5", Round, 2-In-1 Convertible Glides, 3-1/2" Heavy Duty Reusable Round Felt Glides, Premium Quality Felt Backed By Durable Foam For Repeated Use On Hard Surface Floors, Can Be Used Independently On Hard Surface Floors, Or Combined With The 4" Round Shell Glides On Floor Surfaces Such As Carpeting, Glides Can Be Left Under Furniture For Easy Movement During Cleaning, Remove & Store Until Needed Again.