Measurement: double scale building ruler is 24.3 x 9.5 cm, building template is 19.9 x 8.9 cm, furniture building template is 19 x 9 cm, drawing template is 22 x 10 cm, irregular geometric template is approx. 19.4 x 10 cm Material: made of plastic, which is sturdy and durable, convenient for you to use; Color: clear green Use occasions: these templates fit for house planning, geometry drawing in mathematics, art work, architecture, fractional measurement, useful supplies for you in the school and office Design: the corners of the ruler are provided with radians, which are not easy to harm your hands, each ruler has different patterns and scales, can meet your various needs Package includes: 2 x double scale building ruler, 2 x building template, 2 x geometric template, 6 pieces in total