Manfrotto Expan Background Paper Holder Set Metal Chain GreyManfrotto Expan Background Paper Holder Set Metal Chain Black The Manfrotto Expan background system is one of the best wall mounting system on the market. Manfrotto have been making this system for many years; its well made, robust, reliable, and makes life very easy working with full length background papers. The Expans fit into each end of the paper core, then fit firmly onto the optional wall hooks. Using the Expans on optional triple hooks will