The mouse pad for 8040 is 80*40.

The size reference of mouse pad:

Small size is generally 20cmX30cm or less, medium size is generally about 25cmX35cm, and the vertical size of medium size and above is basically 30-40cm, and the horizontal size is 40-50cm, which is an enlarged size;

The horizontal size is 60-70cm, which is a small table mat, which can hold a short keyboard (less than 80% of the size) or a notebook and a mouse; the horizontal size is 90cm or even more than 1 meter, which is a table mat, which can hold a standard 104 keyboard and mouse.