3D Printed Yocan Uni 510 Cartridge Holder, Oranizer. Organize and store 10x1 ml glass test tubes is essential. Each Organizer is printed using high quality plastic filament, hand finished and inspected. This item will fit all standard 510 threaded tubes. As with any current FDM (3D Printing) manufacturing layer lines, seams and small imperfections may be present. Any battery shown in the image is NOT included and sold separately.