A chain is a string-like tool that connects multiple plastic or metal rings. There are a variety of chain structures, such as those with rings on both ends, small balls joined together instead of metal rings, etc. Some of the tubes are designed with consideration given to the friction and impact noise of the chain. The simply designed reel winding types are designed to be easy to pull out and hard to tangle. Chains are used to suspend signboard, POPs, etc. and also serve as partitions for parking lots and equipment. In addition, it may be used for interior decoration, such as to prevent overturning and falling. There are a wide variety of types, including ones with a length and number of rings that can be selected according to the application, and those that use stainless steel materials with enhanced corrosion resistance by polishing for outdoor or humid places.