Features: Open the lid and add 5.6 drops of inks directly onto the surfaces of seal. After completion, press and pull parallel to the paper surfaces. Features a roller style design that can be easily printed with a gentle roll. Double headed design, one end can draw a staff of five lines, and the other end can draw a staff of six lines. Made of plastic, strong and Enduring, light weight and portable. Quickly Draw music staff lines which are great for beginner music writers, calligraphy, journaling or special needs students. Specifications: Materials: Plastic, Inks Color: Yellow Blue or Blue White or Yellow White Size: about 13x24mm or 0.51x0.94inch Package Includes: 1set Music Notation Stamp Roller note: Please allow 1-2cm errors due to manual measurement, make sure that you not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color of the item.