If you're not sure what my ring names mean, read the explanation on my FAQ page. Important Note! Some ring suppliers who list millimeter sizes are actually selling inch sizes. If you're trying to match existing rings that you already have, please ask me if that supplier uses true millimeter sizes or inch approximations. If I don't know the answer, I'll ask you to send me one of each ring size that you're trying to match. Copper - Millimeter Sizes mandrel size ring   name     Price per Troy Ounce 2mm 2M22cu $12.50 2.25mm 2.25M21cu $11.00 2.25M22cu $12.50 2.5mm 2.5M20cu $9.50 2.5M21cu $11.00 2.5M22cu $12.50 2.75mm 2.75M19cu $8.00 2.75M20cu $9.50 2.75M21cu $11.00 2.75M22cu $12.50 3mm 3M18cu $6.50 3M19cu $8.00 3M20cu $9.50 3M21cu $11.00 3M22cu $12.50 3.25mm 3.25M18cu $6.50 3.25M19cu $8.00 3.25M20cu $9.50 3.25M21cu $11.00 3.25M22cu $12.50 3.5mm 3.5M17cu $5.50 3.5M18cu $6.50 3.5M19cu $8.00 3.5M20cu $9.50 3.5M21cu $11.00 3.5M22cu $12.50 3.75mm 3.75M16cu $5.00 3.75M17cu $5.50 3.75M18cu $6.50 3.75M19cu $8.00 3.75M20cu $9.50 3.75M21cu $11.00 3.75M22cu $12.50 4mm 4M16cu $5.00 4M17cu $5.50 4M18cu $6.50 4M19cu $8.00 4M20cu $9.50 4M21cu $11.00 4M22cu $12.50 4.25mm 4.25M15cu $4.00 4.25M16cu $5.00 4.25M17cu $5.50 4.25M18cu $6.50 4.25M19cu $8.00 4.25M20cu $9.50 4.25M21cu $11.00 4.5mm 4.5M15cu $4.00 4.5M16cu $5.00 4.5M17cu $5.50 4.5M18cu $6.50 4.5M19cu $8.00 4.5M20cu $9.50 4.75mm 4.75M14cu $4.00 4.75M15cu $4.00 4.75M16cu $5.00 4.75M17cu $5.50 4.75M18cu $6.50 4.75M19cu $8.00 5mm 5M14cu $4.00 5M15cu $4.00 5M16cu $5.00 5M17cu $5.50 5M18cu $6.50 5M19cu $8.00 5.25mm 5.25M14cu $4.00 5.25M15cu $4.00 5.25M16cu $5.00 5.25M17cu $5.50 5.25M18cu $6.50 5.5mm 5.5M14cu $4.00 5.5M15cu $4.00 5.5M16cu $5.00 5.5M17cu $5.50 5.5M18cu $6.50 5.75mm 5.75M14cu $4.00 5.75M15cu $4.00 5.75M16cu $5.00 5.75M17cu $5.50 6mm 6M14cu $4.00 6M15cu $4.00 6M16cu $5.00 6M17cu $5.50 6M18cu $6.50 6.25mm 6.25M14cu $4.00 6.25M15cu $4.00 6.25M16cu $5.00 6.25M17cu $5.50 6.5mm 6.5M14cu $4.00 6.5M15cu $4.00 6.5M16cu $5.00 6.75mm 6.75M14cu $4.00 6.75M15cu $4.00 6.75M16cu $5.00 7mm 7M14cu $4.00 7M15cu $4.00 7M16cu $5.00 7.5mm 7.5M14cu $4.00 7.5M15cu $4.00 8mm 8M14cu $4.00 8M15cu $4.00 8.5mm 8.5M14cu $4.00 9mm 9M14cu $4.00 9M15cu $4.00 9M16cu $5.00 10mm 10M14cu $4.00 10M15cu $4.00