These covers are designed to protect your floors from the hard caster wheels that are likely found on the office furniture you have in your home office. The Castor Cover is a soft, durable cover that slides over the wheels. Once the strip is properly in place, you apply heat to the castors. By applying the heat evenly, the castor cover will mold to the wheel snugly, providing you with a cheap, efficient chair floor protector that has been proven to increase the lifespan of your floors.