These are hollowed out cylinders of wood, about the size of a common scroll. Kazō uses these containers to hold an extra supply of chakra for when he runs low. Just like his prosthetic, he can flow chakra into them, and will prepare several of these prior to a mission. One canister holds about 75% of his average chakra supply. When using the summoning technique, Kazō needs the aid of these canisters in order to summon larger spiders. This is seen with Arakuregumo and Kuenaigumo who require one and three canisters respectively.