PROMASTER SystemPRO convertible umbrellas have two layers. The outer cloth is made of black material coated with a highly reflective silver surface. The inner cloth is white diffuser material. ProMaster Professional series umbrellas are one of the finest quality photographic umbrellas built today. Features solid core frame construction for a lifetime of trouble free service. The 8mm solid stainless main rod construction and solid core stainless or fiber spines are designed to prevent crimping and stand up to the demanding needs of professionals. These umbrellas all include convenient storage/carrying cases.