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flashing bulb pen,the details as below: Total length: 18. 5cm,Ball diameter: 2.8cm,Ball color: Red, blue, green, yellow, orange, pink and purple Pen barrel color: Red, blue, green, yellow, pink and purple LED light: Red, blue, green, orange color OR rainbow color Button cell bateries model: AG1, three pieces Ink color: Black or Blue Pen refill length: 13. 8cm Flashing way: By switch Packing: 24pcs / PVC can, 576pcs / ctn, carton size: 55x40x41. 5cm, GW / NW: 17 / 15kgs. By switch flashing:When you bang the pen on the desk, the bulb starts rapidly flashing