The Broncolor Flex 70 X 70 cm softbox is designed exclusively for Broncolor Litos flash head, which is used with Senso power packs.This studio lighting softbox is compatible with Broncolor Litos flash headThe Broncolor Flex softbox comes with a removable front face and speed ring for the Litos headThe Broncolor Softbox measures 27.5 x 27.5" (70 x 70 cm) in sizeThe shape of this Broncolor Senso 27.5 x 27.5" softbox is square