Premium quality Swim Stim Pro-Expanders are designed to be ‘pumped’ or left to soak in water, to create the perfect sinking soft hook or feed pellet The same unique Koi technology promotes an aggressive feed response, setting them apart from other pellets on the market Spongy, robust texture ensures they remain firm once soaked/pumped Available 4mm and 6mm in Amino Original, Betaine Green and Red Krill Supplied in 350g re-sealable bags