Only thing is that it does come out of the case only when you open it by hand. So Ive been already gluing them on the heel side and now on the toe side as well. 5 but ordered a 6. Good luck connecting this keyboard to your friends computer or your work computer. If I hadnt gotten one earlier I would never have known how to install this one. The only con i have noticed with this paddle is the handle is little short. they fit nicely on my shelves and did save me space and my shelves look organized. The sound quality and the reach is impressive and once theyre in, you can zone out from the rest of the world (noise cancellation). So for anyone like me with size 7 & up forget it these arent the slippers for you. I ordered a size 10- these sh marked as a size 10 but are a good 2+ inches short, and at least an inch too narrow.