217Pcs Polymer Clay Cutters Set, 27 Pcs 11 Shapes Clay Cutter Tools Kit Stainless Steel with Clay Molds Earring Hooks Holder Cards Bags Jump Rings Earring Backs for Polymer Clay Jewelry Making

I got these to use on clay with my kiddos and they work great, but after about an hour of use, several of them were too bent out of shape to be useful. So just be very careful and maybe don't let young kids use them.