Material:stainless steel, waterproof and sweat Free Engraving:Our 4 sided bar keychain can be personalized with a date, name, location, word or phrase, and up to 4 sides engraved and any name letters, words, date, number, characters. 60-day Money Back & Defective Exchange Guarantee, no-worry purchase! (Tips: Any questions, please no hesitate to contact us immediately through"Contact Seller" after finishing the payment.)