Shinwa Sokutei Triangle with Set of 75264 Ruler, Acrylic, Scale, 2, 30cm,

Product size (approx.): 300mm (height) x 200mm (width) x 4.2mm (depth) Product weight (approx.): 120g Methacrylic resin A 1°C change causes expansion or contraction of 7-8 x 10⁻⁵ mm for every 1 mm of change in temperature. The scale can be marked up to 27cm.