Features: Effortlessly create neat music staves with this innovative roller , featuring plastic construction that ensures imprints for efficient music notation and composition. The portable 5 line musical notation tool combines wear resistant plastic with smooth rolling mechanics, delivering consistent staff pattern ideal for sheet music creation and educational demonstrations. For music teachers guiding classroom instruction, students practicing instrument notation, and composers sketching melodies across piano, guitar, or violin sheet music. Enhances music theory classes, home practice supplies, and professional score writing studios with instants staff line printing that maintains during lessons or workflows. Designs for portability and universals musical application, this staff roller fit effortlessly in instrument cases and art kits while serving all acoustics/string instrument learners. Specifications: Materials: Plastic Color: Black/Green/Pink Size: 4.5x2.8x6.2cm/1.77x1.1x2.44inch Package Includes: 1pc Roller note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.