Schermer’s C-5 Blue Power Loads are blank cartridges For all “K” Series Schermer Stunners. C-5 Blue Power Loads replace C-21 loads and are used for Normal Size Bulls. Power loads are available in increments of: 100 rounds, 500 rounds (1/2 case) and 1000 round (full case). All loads are packed in labeled, plastic moisture resistant canisters of 100 rounds each. Load types cannot be mixed.These power loads cannot be shipped via air and are not returnable. The use of any other power load cartridge not manufactured by Karl Schermer GMBH will void the warranty of these stunners.