No. 10 Side Seam Regular White Envelopes, 4-1/8" x 9-1/2" Signature Bond 24-lb White Wove with Vellum Finish White Sulphite (SFI Certified), 92% Brightness, Vellum Finish, Two Side Seams Under No Window, Remoistening Seal, Boxed with Flaps Down Quality Mailing Products from Linton Mailing Supplies No. 10 Side Seam Regular White Envelopes, 4-1/8" x 9-1/2", Signature Bond 24-lb White Wove with Vellum Finish, SFI Certified - Box of 500 Envelopes