Swim Stims Pro-Expanders are a premium quality expander pellet designed to be pumped or left to soak in water to create a sinking hook or feed pellet. Once prepared, Pro-Expanders internal structure creates a soft yet highly durable pellet that is both easy to hook and hair-rig. Pro-Expanders are available in Amino Original in micro, 4mm, 6mm. Betaine Green and Red Krill flavours are available in 4mm and 6mm. Now available in 350g re-sealable bags.