Kamui has answered the feedback from many players that have been using the 0.98. The 1.21 still has the grab but is a harder compound. It also allows the player with a pre-shot routine to chalk more often. 1.21 means less residue left on the cue ball as well. Not abrasive to your tip, coats evenly, decreases miscuing, stays on your tip longer and increases friction on the cue ball. KAMUI Chalk consists of much finer particles than standard chalk designed to maximize friction and offer a larger sweet spot to generate more spin to the cue ball. Reducing slippage decreases deflection, giving the player a more accurate aim when English is applied.