The Pro Expanders from DYNAMITE BAITS contains the full appeal of SwimStim in the form of expander pellets. Four flavors with two sizes 4 and 6 mm each. F1 Sweet, Betaine Green, Krill and Amino Original. Premium quality Swim Stim Pro-Expanders are designed to be 'pumped' or soaked in water to create the perfect sinking soft hook or feed pellet. The same unique Koi technology promotes an aggressive feed response, which sets them apart from other pellets on the market. The spongy, robust texture keeps them firm once soaked/pumped. Available in resealable bags of 350 g