A4 sheets, 20 Sheets/48 labels per sheet, label size: 45.7 x 21.2mm, permanent adhesive, laser coated, suitable for Black & White Laser Printers, ideal for property protection, pre-printed residue left if removed, oil/dirt/UV resistant/water resistant & tear-proof. If you're looking for security and peace of mind, then anti-tamper labels are what you need. Apply these labels to special products or electronic equipment, and if they are removed a checkered pattern will be left behind immediately indicating tampering has taken place. Any attempts to remove the Avery Anti-Tamper Laser Labels result in the material disintegrating and leaving behind a pre-printed residue. This makes it virtually impossible to remove and tampering look immediately obvious. Perfect for the securing and sealing of products, documents and marking equipment. These security labels come in 48 labels per sheet in 45.7 x 21.2mm format and are also oil and dirt resistant, water resistant and temperature resistant (-4