This mathematical mat is great for basket weaving. It has many different measurement types and formulas that can be used. It is a two-sided mat. One side is for the Metric System, and one side is for Standard US Math. It has an X and Y axis. It has compass layouts for round and circular measurements and items. It can measure angles and degrees of angles. It measures circumference, radius, and diameter. It even has concave and convex curve measurements. This mat is a grid, so you can take many measurements to fit your project. The front even has a pattern for measuring hexagonal items. This mat has grid lines running throughout. The size of the mat is approximately 18 inches by 12 inches.