Blue Summit Supplies pack of 100 Premium First Class Mailing Envelopes, designed to meet all your mailing needs with ease and efficiency. Measuring 9-1/2” x 12”, these envelopes provide ample space to comfortably accommodate multi-page documents, catalogs, brochures, and booklets without folding or bending. The strong self-seal closure ensures a secure fit, giving you peace of mind that your documents will remain intact during transit. Crafted from premium 28lb white wove paper and printed with a security tint pattern, these envelopes present a clean and professional appearance while keeping the contents private. The Double Window design allows you to display “To” and “From” addresses to your recipients.