No. 10 Regular Side Seam Window Envelopes, 4-1/8" x 9-1/2", Vellum Finish w Blue Tint, 24 lb (SFI Certified), Pres-Stik Self-Sealing, Poly Window (1-1/8" x 4-3/4") - Box of 500

No. 10 Regular Side Seam Window Envelopes, 4-1/8" x 9-1/2" (Window, 1-1/8" x 4-1/2") Vellum Finish w Blue Tint, 24 lb (SFI Certified) Pres-Stik Self-Sealing Latex Adhesive Two Side Seams Under, Twin Flaps Down Box of 500 Envelopes, Mfd by Western States Envelope