These are Premium Quality Rhodium Plated Sterling Silver Backs. They are Not Your Typical Cheap Flimsy Sterling Silver Backs. They are Durable and Made for Every Day Use. Will Last a Long Time.

• 1 Piece: Rhodium Plated Sterling Silver Standard Weight Friction Butterfly Push Back
• Will Fit Post: .026"-.030"
• Metal Quality: Rhodium Plated Sterling Silver
• Outside Diameter:5.2 mm