Features:Unique DNA chemical molecule deisgn: for people who have desire to fight off additions, science lovers, chemistry enthusiasts, biology majors, biochem studies, and chemistry majors.Scientist Keychain Gifts: Biology Chemistry Keychain with Science Symbol Gifts with Atom Charm, Microscope, Measuring cup. Special Chemistry Science Lovers Gift.Great graduation keychain: suitable for bag, wallet, backpack, car interior decoration, for key holder.Material: Made of zinc alloy, excellent electroplate technique,make it solid,durable and long lasting,will not tarnish over for time.This science teacher for key chain contains biological DNA molecular structure and so on. Specifications:Material: Zinc AlloySize: As Picture Show Note:Please allow 1-2cm errors due to manual measurement,Plaese make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:1 Piece Keychain