content: I was getting ready to send these back and filled out the information for Amazon. I noticed you could buy a large size, so I thought there were two different size Andis blades. Not the case. These don't snap on like the package says, they slide on. The directions are incorrect and you must attach the two metal snap hooks to the bottom of the blade and then use your thumb(s) to slide the comb forward and along the top of the back of the blade until it snaps onto the teeth. It is actually simple once you know. These appear to be of high quality and made very well, so I expect these to last as long or longer than the clipper. I gave it one star because the idiots that sell these have not addressed the incorrect instructions on the package, nor have they modified the Amazon site to rectify the issue. I will change this review if they ever get a clue.