These open jump rings measure 4mm and are made from 21 gauge steel wire. They are sold in 25 gram package approximately 700 pieces per package. These jump rings contain +/- 8% nickel in the plating to keep it from being damaged when working with tools to manipulate the jump rings. These jump rings are available in many plated finishes and are 100% lead-safe. * Sold by 25 gram package * Approx. 700 Pieces per Pack. * 21 Gauge Steel Wire. * 4mm Diameter. * Made from steel. * 100% Lead-Safe. * Available in many finishes. Care Tips: Do not swim or bathe with this jewelry. Try not to spray perfume or rub lotions on this product as it could mar the finish. To clean, use gentle hand soap and warm water. Pat dry with a paper towel. Do not use jewelry cleaners or a jeweler's cloth. Read more about how to take care of plated jewelry. Super fast shipping for USA customers. Hurry while supplies last! *These are sold by weight the piece count is just an approximation and may differ on each shipment.