Description This item is professional and practical physics experiments electromagnetic dot timer papertool. Can be helpful for students to do physics experiments. Simple and useful, reliable and practical, very easy to installand simple to operate,giving you hugeconvenience. Features - Color: White . - Material: Paper. - Size:6.00X6.00X2.00 cm/2.36X2.36X0.79 inch. - Made of premium material for simple and safe in use, useful and simple to operate for experiment. - You will have good use experiencebecause of the perfect workmanshipof this product. - The paper can be used forelectromagnetic 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