Business Source 99714 No. 10 Self-Seal White Security Envelopes, Box of 100. Peel-to-seal envelopes feature a self-adhesive flap to create a tight seal without requiring any moisture. Distinctive security tint keeps your confidential items hidden from view for secure shipments. White wove finish creates a crisp, distinguished appearance for use in any professional setting. 24 lb. stock adds rigidity to the envelopes to stay strong during shipping. Envelopes are perfect for businesses, schools, personal use and more.