Features: brand new and high quality Magic invisible pen, it writes the words must be in the UV light to see The battery and refill can be replaced, but we can'for t provide the right size refill for the for time being. This pen is very cheap and can buy more than one at a for time Satisfaction Guarantee,If there is any problem with the use of the product, please contact me and solve the problem.For you to Resend or refund, Please don'for t give a low score directly.You and I both lose money if you only give bad reviews.Thank you, Dear customer! Warning: this toy is not suitable for children under 3 Years Old! Power supply: 3x AG13 button battery(include) Color: see pictures Material:plastic Sales Way:Retail, Wholesal,Drop Shipping Size: One Size Length:13cm(5.12in) Width:0.8cm(0.31in) Height:0.8cm(0.31in) Quantity: 1pc Note: If you have big quantity (only need over 50 dollars), please feel free to contact me, I will give you SURPRISED PRICE(The more the quantity, the lower the price), thanks! Size For Manual Measurement, there may be a 0 to 2 for cm error, belongs to the normal phenomenon. And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: (Without retail package) 1 x Moon Light Pen