The Beadsmith crimp tubes can be used with wire and flexible wire. These jewelry making supplies help to create earrings, can be used with necklace string or cord, and can be used with beads for bracelets. Combined with beads for jewelry making and the proper wire for jewelry making, and you will be able to complete any DIY design you can come up with. Add this jewelry string to your crafting supplies today and unlock your artistic talents. This package comes with an assortment of crimp tubes that give you a design flexibility with all your jewelry designs. To use these properly, you should also use crimping pliers or flat nose pliers. This will allow you to properly secure the crimp or fold it onto the wire to hold it in place.Details:Black oxide475 piecesContents:1.5mm x 1.5mm crimp tubes (250 pieces)2mm x 2mm crimp tubes (150 pieces)2.5mm x 2.5mm crimp tubes (75 pieces)