Including 100 pieces #10 envelopes in 10 colors with 10 pieces per color, measuring 4.13 x 9.49 inches. Made of 110GSM colorful paper, durable and fade-resistant with slight thickness variation by color that does not affect use. Features peel-off strip for easy sealing, smooth surface for writing. Suitable for correspondence, invitations, thank you notes, and holiday occasions. Three size combinations available. weight: 1.47 pounds.