Staples Easy Close No. 10 Security-Tint Envelopes, 4-1/8 x 9-1/2 inches, Box of 100 No. 10 security-tinted envelopes to fit secure letter-size documents. Security tint and 24-pound woven paper. 4-1/8 x 9-1/2 inches. EasyClose square-flap closure for fast closing. Box of 100 envelopes.