Open Side Booklet Envelopes, 10' x 13', 28#, White, Side Seams, Pressure S

To make the most durable step-up ring Breakthrough Photography simply took the craftsmanship, build quality and durability of their professional filters and adapted it to the step-up ring.Breakthrough Photography manufacture this step-up ring with brass and then apply a matte black electroplated finish, which withstands corrosion and other abrasive... moreelements often encountered in outdoor photography. The result of better construction and materials, combined with a proven design makes this step-up ring the most durable and functional step-up ring available to professional outdoor photographers.