I initially thought that the pellets were the same size as the 1.5kg ones, however, these are bigger and I just feel that our guinea residents do not bother eating them just as the smaller sized ones. I think that the guinea residents think these are thicker and they want an easy-to-eat pellet. I'll check if they'll be able to finish this in a few months, but I highly doubt it. The 1.5kgs are easier to feed to the guinea residents due to the thinner diameter.