Parallel tracing wheel Multi, ergonomicThe parallel tracing wheel Multi from the prym. ergonomics series combines all the advantages that the chalk wheel Mouse has. It convinces with its ergonomic design and its good feel, the finely measured washable chalk line, with refills in white and yellow and the practical viewing window for the level of chalk. In addition, a side accessory can be attached to this chalk wheel, which runs parallel to the chalk wheel of the mouse. The spacing of the