?DIMENSIONS?Opening diameter: 0.375", Product size: 1.77" x 0.59", Weight: 0.019 lb, Colors: Black & Dark Grey. Small pocket pill container is easy to carry when traveling, camping or any outdoor activities. ?ERGONOMIC DESIGN?Special screw cap design allows screwing without hand-slipping. A good medicine organizer for daily life. ?NON-TOXIC MATERIAL?Pill keychain container is made of Aluminium Alloy, hardness is assured. Durable and Corrosion resistant. ?STRONG AIRTIGHTNESS & WATERPROOF?The O-ring fills the gap after tightening which makes this pill box Moisture-proof. Pills will be well protected from getting oxidized and moist. ?PORTABLE & LIGHTWEIGHT?Each pill case is equipped with a key ring, which can be buckled on keychain, on necklace, handbag, purse or can be used as a zipper puller for your coat.