Descriptions: This is a strong flexible rule which can be bent into many shapes.,Exceptionally flexible, will not discolor or decompose with age.Ideal for use in: drafting, engineering, construction, surveying, dress making, craft and a multitude of other uses. Features: This is a strong flexible rule which can be bent into many shapes. Exceptionally flexible, it is made of vinyl that will not discolor or decompose with age. Can be arbitrarily shaped,will not rebound, and double sides can be used. Raised edges designed for ink ruling, and easily fitting on a drawing board. It is applicable to arc measurement, which is used to bend to the radian and measure contour lines. Ideal for use in: drafting, engineering, construction, surveying, dress making, craft and a multitude of other uses. Specifications: Material: Plastic Front side(Optional):30cm/60cm Back side:12inch/24inch Weight:83g,146g Package Included: 1 x Flexible Curve Ruler