These new police seals are made of a strong 50 micron polypropylene face material, with a strong permanent adhesive that leaves a “VOID” mark if an attempt is made to remove it. Each measures 200mm x 30mm (7.9” x 1.2”), with a consecutive bar code/serial number. Red background with black printing, you can use a regular ink pen to complete the white write-in area. Seals come packaged with 1000 consecutive seals per roll.