Made of high strength aluminum alloy, anti-rust, anti-scratch and unbreakable. Super precision CNC cutting craft, compact thread and easy to screw on or off. Come with a key ring, make it fully water and dust proof. Perfect to store pills, tablets, vitamins, capsules, money, u-disk, matches, cigar or fishing gear. Imprint it with your company name or logo and achieve the great side affects of a successful campaign!