7-piece stationery set: The set contains 2 compasses (1 small and 1 large), 1 extension cord, 1 converter head, 1 box of pencil leads, 1 pencil sharpener, 1 ruler pen), they are all completely tucked away in a box for easy organization of your storage box. You can use them to complete the drawing of circles with a different radius. . Sturdy metal + plastic material: The whole stationery is made of zinc alloy and plastic material. The combination of plastic and metal makes it easier for you to use compasses to draw pictures. At the same time, it also guarantees the product stability, durability and resistance to rust, abrasion and bending, and can be used for a long time. . Gear Screw Adjustment: The 2 drawing compasses are used to adjust the radius of the circle through the compass screw gear. This adjustment method can ensure that the radius will not change easily, and you can draw in one go without worrying about the impact of the difference in values. This method of adjustment also prolongs the life of the compass. . Multiple combinations: Since our kit contains conversion heads and extension beams and other parts that can be recombined with compasses, you can select different Draw parts according to your needs. One leg of the two compasses is detachable, you only need to save the disassembled parts, and you can divide and combine them without interfering with the next use. . Professional Compass with Wide Uses: This drawing compass can be professionally used for drawing. It is an aid for mathematics, artistic design and technical drawing. Therefore, students, art students, mathematicians, carpenters and engineers can use it to make more accurate drawings. .