We first bought our two little ones Oball, but it annoys quite fast times because they can take into his mouth their toys necessarily. Alternatively, this rattle is ideal because it can purely take at least a few millimeters further and because it is of course easy to grip. I guess the thing also promotes coordination between the two hands, because they always get it with one hand somewhere, grab and then try to take the second small Oball with the other hand.