I used to have straps to keep the corners of my fitted sheet in place but after a few months of use they began to fray and the metal parts started coming apart...So I purchased these and I am SO impressed! I don't think I will be having to replace them for a long long time! They do what they're supposed to do and keep my fitted sheet from slipping off the mattress! I like how they aren't made from any sort of fabric material so they can't fray and they seem to be very sturdy so I don't worry about them falling apart!