Coordinate to impress with Royal Cotton? stationary. Watermarked, business-weight, 25% cotton fiber blend stock features a 96 GE brightness rating and a smooth, smear resistant finish. Traditional seam and gummed flap produce a reliable seal. Envelope Size: 4 1/8 x 9 1/2; Envelope/Mailer Type: Business/Trade; Closure: Gummed Flap; Trade Size: #10.