C5 Pillar Box Red Window 120gsm Peel & Seal Envelopes (Qty 500) 162mm x 229mmMake a striking impression with our C5 Pillar Box Red Window 120gsm Peel & Seal Envelopes. Measuring 162mm x 229mm, these vibrant red envelopes are perfect for sending A5 sized documents, brochures, and personalised correspondence. The bold pillar box red colour is ideal for occasions like Valentine's Day and Chinese New Year, adding a festive and celebratory touch. The clear window allows for easy viewing of addresses or branded inserts, providing