Swim Stim Expander Betain Green 6mm 350g 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._ Their spongy, robust texture ensures they remain firm once soaked/pumped.__ Size 6mm.350g resealable bag.