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A set of 2 weaving rulers for matching yarn to the reed number. The ruler shows dimensions in centimeters and inches. The reed number (for example 50/10) is the number of threads in a 10 cm warp. The dpi number under the reed number (for example 12.5) is the number of threads per inch of warp.
To select the density, you need to wind the thread on the ruler, and you will see how the warp will look in the selected reed number.
The material is eco-friendly birch plywood.