Name: key card colored plastic keychain key ring card number cards
classification (a price for a single price)
Size: about 5cm; width 2.2cm; metal ring diameter of about 1.8cm
Material: Plastic + metal
Weight: 2g
Color: green， blue， black， white， yellow， red， optional
Overview: The labels above with plastic protective sheet， remove the metal ring， you can replace the paper itself. According to the need for handwriting recognition， easy to record and figuring
