Manufacturer Aimoh. Premium 24 LB. Heavyweight 28 LB. Premium 26 LB. EnveGuard ✓ ✓ ✓ no data no data no data Item# 34100 34600 34300 36750 36050 36100. Unit Count 100 Count. our check envelopes are designed with an ultra strong SELF-SEAL adhesive strip to create a full, super secure seal across each envelope’s width that won’t easily open or tear.