The sweater stone is a fabulous light weight brick of pumice. We use it on all our cashmere and flat wool sweaters if they’re pilled. You just gently stroke the stone over your sweater and the pills are gently removed. It does not snag or pull or make holes-better than anything we have tried! They are availabe at our 906 store for $10. It will last for a couple of years. If you have cashmere sweatrs, you absolutely need one of these!