Our choice surgical stainless steel personal monogram keychains are completely stainless. The disk is 1" 1/2 diameter machined from plate stock, then carefully surface engraved with your monogram letter choice. The keychain is sturdy and well made for durability. Ideal for outside use around water, at the shore, boating, fishing, and many other uses. Hypoallergenic and rust resistance, made from the same surgical steel used in the food industry.