stainless steel The pin size：2.2*2.2cm Perfect for boyfriends, husband,dad it come with a black box. It can be very good accessories and air isolation, resist oxidation.can keep the package safe and perfect. AFTER-SALES SERVICE-Any question, please fell free to contact us, make sure in 24 hours reply. It would be our pleasure to service for you. If you don't like the items would be 30 days refund guarantee. Stainless Steel Celtic Knot Men Brooch and Pin Coat Accessories Jewelry