ship from Japan [Jas size] We will carefully develop it based on the mouse substance. Adjust not only the shape but also the thickness of the sole for each model. [Reliable use of 3M raw material] Highly durable, no residue after removal. High quality PTFE Teflon material made in the United States 3M is used from the surface to the contents to ensure high durability. No scratches or glue will remain after removal even after a long period of use. [Emphasis on slippage of mouse movement] Lubricating minerals are added to PTFE Teflon with our unique technology. Achieve excellent sliding.