They are rubber tips that you glue on with the glue that they provide.There are 40 in a set,so if you only do fronts.....you'll have enough for 4 changes.Sometimes one will fall off and then all you do is replace it with another one.There is no way that they can scratch furniture and stuff with them on.
YOu can go to www.thecatandkittenstore.com
and look at them and order them.I just got mine the other day in the mail, and used them on Corwin and Lilly.I LOVE them and will NOT go without them from now on.
It saves you,your furniture and curtains.Plus, to me.............it is more humane then declawing them or even trying to constantly correct their scratching behavior by yelling at them or whatever.
If you want to, you can PM me and I'll answer any questions that I can about them.
I got 2 sets and it was $31.70 with free shipping.It took about 4 days after I ordered them to get them in the mail.