Poppy Crafts Thermal Binding Covers - A4 3mm Clear 5 Pack. Achieve a professional, polished finish with these clear thermal binding covers. Perfect for creating sleek, durable bound books, reports, or presentations. Ideal for use with Poppy Crafts Thermal Binding Machine (PCTHERMALBINDER) & Poppy Crafts Thermal Binding Adhesive Glue Strips (PCTHERMALGLUESTRIPS), all sold separately. 3mm holds 16-25 sheets.