New and improved screw on design! This all-in-one bamboo travel toothbrush and case is perfect for all your overnight trips and for those that love to pack light! Made from 100% renewable bamboo, this travel toothbrush is both lightweight and sturdy. Includes an air hole on the end for drying. Bristles are bio based- made from castor oil and infused with charcoal. Bundle: The all-in-one bamboo travel toothbrush + Replacement Head How to Care: Bamboo is naturally antimicrobial, but we recommend to air dry each piece on a towel in between uses for longevity. When ready, just buy a replacement refill head and keep the case portion to reuse. Size: 4.38" in length for travel, 7.13" when put together and 7/8" in diameter. Packaging: Kraft paper box. Note: The refill heads for the 2.0 design are not compatible with our original all-in-one travel toothbrush and vice versa.