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Humber Board Backed Envelopes- In a Range of SizesOur large range of board backed envelopes are made from recycled materials for the environmentally conscious. Manufactured from a traditional 600gsm grey board back and faced with 115gsm manilla kraft paper. These board backed envelopes are pre-printed with PLEASE DO NOT BEND in red to ensure care is taken over your package. Ideal for photos, certificates, documents and contracts providing great protection from tearing and creasing.