1 scattering tube - tsutsu - size 2 (black) for powders with particle size smaller than 150 μm - e.g. Eggshell powder Length: approx. 150 mm Diameter: 10 mm The original sprinkle tubes - tsutsu - or powder tubes - funtsutsu - were made of bamboo but are now displaced by aluminum tubes. We offer the aluminum tubes, which are very popular in Japan, because the inner surface is smooth, which causes the litter material to trickle more evenly. Aluminum powder tubes are also easier to clean when changing powders. Aluminum powder spreader tubes can also be cleaned under running water or in an ultrasonic bath.