This is a holder for a usb 2 button keyboard. I allows this 2 button keyboard to work as a page turner / foot pdeal for reading music, games or ebooks. It is similar to the 4 button one thats also available for download. I have included the file parts as individual parts or if you have a big enough printer there is a stl file containing all 4 parts to the model. The springs i used was heavy duty springs. This is heavy duty, I print mine in TPU and put a ply base at the bottom with a non slip rubber mat. Please like and share.