This item is professional and practical physics experiments electromagnetic dot timer paper tool. Can be helpful for students to do physics experiments. Simple and useful, reliable and practical, very easy to install and simple to operate, giving you huge convenience. Features - Color: White. - Material: Paper. - Size: 6.00X6.00X2.00 cm/2.36X2.36X0.79 inch. - Made of for simple and in use, useful and simple to operate for experiment. - You will have good use experience because of the perfect workmanship of this product. - The paper can be used for electromagnetic dot timer, electric spark timer, excellent and simple. - The paper is convenient for physics experiment, easy to observe, reliable and practical. - Helps to explain relevant knowledge in class, useful and practical paper tool for school. Package list: 10 x rolls x physics experiment papers