Mafrotto has a range of background accessories that will help you optimize your work. These background support systems are simple to use, strong, flexible, and extremely efficient. They can be used both in a studio setup, as well as in outdoor on-location setups. Manfrotto 091 MCG Metal Chain will Improve the power and flexibility of your Expan drive greatly. It has been designed to replace the plastic chain on Expan 046 to further improve its performance. This grey-colored metal chain is made of technopolymer for additional strength. It weighs around 1.32 lb and has a total length of 3.5 m (137.8 inches).