Quality MaterialMade of OPP plastic shell and metal measuring blade, contrasting colors along with clearly printed numbers and lines make these tape measures easy to read. Stable slide lockThey have a stable slide lock that holds the measuring blade securely in position, retract smoothly whenever you release the lock. Proper FunctionThese miniature tape measures arent a gimmick, they measure up to 1 m/ 3 ft, easier and clearer to read than other mini tape measure with small and vague numbers Antirust CoatingThe small tape measure is added with antirust coating. It may smell a little when you just use it. Usually, the smell disappears after using it for a while. Small & Lightweight 4cm in size and only 15g in weight make this tape measure very lightweight, you can hang it anywhere with the included keychain.