Patented REVELOPE® closure technology. The protective flap for lifting protects against drying out and ensures extra-long durability, without peel-off strips. Hot-melt adhesive provides ultra-strong and immediate adhesion. Security slits make all opening attempts visible. With security inside print - discretion for your contents. Bright white 90 gsm FSC®-certified envelopes in functional packaging. Contents per pack: 35 pieces.