Feature: 1. [10 Pcs Set] This set includes 10 double sided black laser testing papers with size of 210 x 285mm (8.3 x 11.2 inch), providing ample supply for testing needs. 2. [Dual Sided Usage] The black laser marking test paper is designed for double sided use, allowing for efficient testing of laser equipment. 3. [Clear Laser Printing Area] The laser test paper features a white laser printing area with clear spot edges, ensuring easy identification. 4. [Wide Applications] Suitable for use in semiconductor laser marking machines, fiber laser marking machines, laser cutting machines, UV laser marking machines, laser beauty equipment, etc. 5. [Versatile Usage] Ideal for adjusting the performance and spot quality of laser marking machines, laser welding machines, laser cutting machines, as well as testing the spot adjustment and energy of laser beauty equipment, laser eyebrow washing machines, etc. Specification: Item Type: Laser Testing Paper Material: Paper Color: Black Size: Approx. 210x285mm / 8.3x11.2in. Package List: 10 x Laser Testing Paper Note: Double sided black laser engraving test paper is suitable for laser welding machines and laser cutting machines with a power of 2W to 500W. The higher the power, the more sensitive it is, and the test paper will only show traces when the machine is in use. Power over 2W. If using a higher power device, start testing from low power first, gradually increase the power until the appropriate effect appears, to avoid excessive power piercing the laser test focus paper.