I used to use this arm swing device. I'm selling it now that I no longer use it. You can find many videos explaining how to use it by searching "FOUGUE how to use" on YouTube. The Velcro-like straps that attach to your hands can be substituted with regular Velcro or rubber bands. Thank you. ■■FTW FOUGUE■■ ◆Material: FTW Ceramics ◆Size: 8 x 8 cm ◆Contents: 2 FOUGUE devices