New IMX material, the current ones are GL3 material. 4 models, they won't have a 953 in IMX. I was hoping they would lengthen the 904 but they didn't. I was going to replace my current models with the new ones but decided it wouldn't make a big enough difference to be worth the cost especially without a 953 (love that rod for the smaller savage gear 4 plays) and the 904 ( thought they should have made it 7'11").