Convenient to use Give you confidence Lightweight and portable Great tool to whitening teeth Effectively make tour teeth white Can safely and effectively remove many external stains Specification Material:gel Weight:22g Capacity:4ml Specifications: Convenient to use Give you confidence Lightweight and portable Great tool to whitening teeth Effectively make tour teeth white Can safely and effectively remove many external stains Package Included: 1 x Teeth Whitening Pen Notes: Due to the difference between different monitors, the pictures may not reflect the actual color of the item. Compare the detail sizes with yours, please allow 1-3cm error, due to manual measurement. Please leaving a message before you give the bad feedback, if the products have some problems. Thanks for your understandings.