The hole for the toothbrush and the partition of the protrusion at the bottom have a hexagonal honeycomb structure. These two types of hexagons make each toothbrush stand on its own, and are a point to prevent collisions of brush parts that are particularly worrisome to touch. It has a simple structure, especially on the inside, and the top lid and bottom are separated, so it is very easy to wash and use cleanly. The glass-like transparency is expressed with highly transparent and durable acrylic resin. It's not too light, so it's hard to fall over, and it's easy to blend in around water.