Optical Principle: Optical drawing board uses the principle of optical transmission to project the original onto the tracing to achieve accurate copying and depiction. Premium Material: Sketch drawing board uses high PVC board, which is clear and transparent, and the copying is more accurate. Adapt to Different Light: Portable optical tracing board adapts to different light environments and can be easily copied during the day or night. Anti Slip Base: The light copy pad anti slip base design ensures that the tracing table is stable and firm and will not tremble during the copying process. Practical Tools: Drawing tracing board helps novices quickly master copying skills and improve the of painting. Provide professional copying tools for advanced painters to improve their painting level. Specification: Material: PVC Size Chart: Package Includes: 1Set Optical Image Drawing Board(with Stand) Note: Please allow slightly errors 1-2cm differences due to manual measurement.