Durable heavyweight paper resists tears and rips. Fully gummed flap produces a secure seal. Envelope Size: 4 1/8 x 9 1/2; Global Product Type: Envelopes/Mailers; Envelope/Mailer Type: Invitation and Colored; Closure: Gummed Flap.
From the Manufacturer
No. 10 business envelopes feature an extra bright red color to get your mail noticed. 60 lb.