The Rotalux Speedring for Elinchrom from Elinchrom is required for all 11 Rotalux shapes and sizes, and is compatible with all Elinchrom heads since 1974. Rotalux speedrings are designed to withstand hard work and stress, even when the largest-sized octagonal Rotalux softbox is assembled and disassembled every day. One speedring is required to build any of the 11 Rotalux sizes, regardless of the softbox shape.