Our String & Washer Envelopes are a high-end mailing essential, crafted with premium 180gsm material and a smooth wove finish; they are available in red, manilla, black and white . Uniquely designed with a string closure for repeat use, the eco-friendly design is 100% plastic-free and recyclable. Choose from sizes C6, DL, C5 & C4 in a pocket board format for a simple yet stylish way to communicate your correspondence. This is the ultimate solution for recyclability in the envelope world.