Metal: Stainless Steel; 

Size: inner diameter 12mm; width is 4mm

Quantity:1 pair ..

Return Policy: If there's any issue with the item you received, feel free to contact me, I will work with you to solve it! Refund your money back or send a new one again. ...

Shipping Item will be shipped within 1 business day after payment clears. Domestic items will be shipped via USPS First-Class Mail with delivery confirmation.