Transparent String Tie Envelope---flexible, wear-resistant, waterproof, safety and practical. Feature: Color: 12 packs in blue, yellow, red, green Material: environmental protective PVC Type: side-opening expansive envelopes Legal Size: approx. 14x10x1inch(36x26x3cm) Application: school, business, families, testing, thesis defense for sorting, organizing and storing files. This clear string envelope is made of high grade PP material with a convenient twisted string buckle. It is popular by teachers, designers, planner at office for organizing and storing important documents and notes. If you like, you also can give it to your friends, workmates and partners as a gift.