【4 Piece Set】Our sewing ruler set includes 4 different types of sewing rulers: comma curve ruler, triangle ruler, armhole ruler, armhole ruler 【Metric】The sewing ruler uses metric measurements. the unit is centimeters. (1 inch = 2.54 cm). This sewing tool set can meet your essential drawing and sewing needs. [Triangular Ruler] The triangular ruler is not a real centimeter, but it can change the proportions. 【Clear Scale】The ruler is made of durable plastic with good flexibility, allowing you to draw on paper easily. Wide Application: The sewing ruler is widely used by students, designers, pattern makers and tailors for drawing, hand cutting, etc. Sewing pattern making and other garment creations. Package size approx: 320* 160*5mm Note: The data is all measured manually. Due to differences in light and display, there may be 1-3cm deviation. Please refer to the actual item received.