FLYUP Fitness Removable Handles - The handles detach so you can use the FLYUPs on your hands or feet. Works on Most Surfaces - The FLYUPs work on carpet, rugs, astroturf, and other soft surfaces. Use with the felt Hard Core Covers (included) and the FLYUPs work on wood, tile, and other hard surfaces. Durable - The FLYUP is made in the USA of high quality resins to resist wear and support regular active use. Fun - We think working out should be fun for everyone. Find something you enjoy doing and it will become a habit. The FLYUP is an effective way to get in a fun workout.