The package included 20 pieces lobster clasps (12mm) and 1480 pieces open jump ring which have 6 sizes (10mm,8mm,7mm 6mm,5mm,4mm) in bright silver color. Package also contains with 1 tweezers, 1 needle nose plies and 1 jump ring tool opener. | Individually packaged and easy to carry because all the lobster clasps and open jump rings are packed in a 7 grids plastic jewelry organizer case to avoid mixed together. It is perfect for both keeping the jewelry rings compartments with individual sizes and small enough to not to clutter your work area. | This jump rings are made of high-quality metal, which is durable and sturdy, not easy to rust, won’t do any harm to your skin, perfect for beading making and DIY earring. The jump ring opener will help to make open and close the jump rings easier and the tweezers can help to select the jump rings from the box. | These open jump rings and clasps set are suitable for many projects like many jewelry beadings making and repairing, making bracelets, repair necklaces, making chain mail, charms, anklets and other jewelry related projects | All jewelry making supplies are lead and nickel free, It won't do any harm to your skin.