This set of open jump rings are made of alloy which is resistant to rust, corrosion and tarnishing. Also, it is health and durable and requires minimal maintenance. Being hypoallergenic and safe, it is still able to endure a lot of wear and tear. So it has been widely applied in jewelry making, cloth, gifts, bags, hats, and shoes, etc. Features - Color: As Shown-Material:Alloy- Size: 2.80X2.80X0.30cm/1.10X1.10X0.12in - With spring ring design, it can attach to a wide range of fixing points quickly and securely. - The spring o-rings are suitable for backpacks, handbags, key, kettle, dog leash for daily life etc. -The spring buckleis made with good craftsmanship and has a smooth surface and can be used safely. - The round key ring is made of sturdy material, which is strong and can serve you for a long time. - With small size and light weight, this snap ring is convenient to carry and store. Package list:15 x Spring O-rings