This is a listing for a set of five-color transparent acrylic rulers for drawing algebraic curves, useful for organizing the results of natural science experiments. - Brand: Uchida Yoko - Type: Curve Ruler - Features: Unlike standard French curves, these rulers are designed with algebraic curves based on theory and calculation, making them suitable for graphing experimental and research results. - Shape: Five-color transparent drafting ruler - Colors: Green, purple, blue, yellow, orange - Material: Acrylic resin - Condition: Clean and in good condition. The last photo is included as a bonus. Please understand that this item has been stored at home before purchasing.