FLYUP Fitness Deluxe 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 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.