Lists the lineweights in the plot style table. You can modify existing lineweights, but you can't add or delete them. If you change a lineweight value, other plot styles that use the lineweight also change.
When you edit a lineweight value, it is rounded and displayed with a precision of four places past the decimal point. Lineweight values must be zero or a positive number. If you create a lineweight with a zero width, the line is plotted as thin as the plotter can create it. The maximum possible lineweight value is 100 millimeters (approximately four inches).