All of book rings would not open for the first time without using a pair of pliers to force open for the first and many of them could not be opened without damage and had to be thrown away.I would not buy again!
Those rings have cute colors that students like. The reason I did not give a five star is that 3 of the rings did not work (impossible to open them). Staples did an exchange but the student's projects had already been completed with some plain rings I happened to have in reserve. So there were some disappointed kiddos.
The rings that would open work great. Unfortunately not all the rings worked. Some were difficult to open but after wasting loads of time I managed to get 13 out of 16 to work. I expected better from such a simple product.