Kum Students 15cm Stop & Go Flex Triangle Protractor Compass 16cm Triangle protractor with Stop & Go removable grips and anti-smudge rests. The innovative Stop & Go Grips allow a precise fixation of the drawing instrument and thus guarantee millimetre accurate working. Manufactured from an extremely flexible material, free of harmful phthalates Made in Germany Why buy KUM Drawing instruments? KUM draws better. \* To ensure millimeter precision KUM uses high precision injection moulds (all built in their factory) that even take into consideration the shrinkage of the plastic when it is ejected from the moulds and cools. By doing this, it ensures that all rulers and protractors indentations are very precise and identical. \* Temperature normed precision hot stamps ensure that the scales are stamped to exact precision onto the ruler and protractor slats. An inexpensive tampo- or silkscreen print, often used on cheap drawing instruments, can never offer this kind of precision KUM STOP&GO This series sets new standards for drawing instruments. The innovative and patented KUM STOP&GO Grips allow a precise fixation of the drawing instrument and thus guarantee millimetre accurate working. KUM STOP&GO Grips enable a fixed positioning on the paper and thus prevent slipping in case of parallel or longitudinal displacement.