PROMASTER Professional series umbrellas are one of the finest quality photographic umbrellas built today. Our professional umbrella series 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 a convenient storage/carrying cases. Available in professional sizes up to 72”.