Name: key chain (keychain), can not join into the oil or oil 
 Material: PVC + oil + metal ring / chain 
 Function: other materials in general different from conventional key chain, PVC key chain into the oil can be more attractive, because of PVC materials and internal finishes are available with a variety of colors and the surface can be printed any logo, can be into the doll house or cartoon characters, add glitter, flashing lights; both beautiful and practical. 
 Low cost, high value, is the first choice for promotional gifts.