Letsip® K-series are extra large tongue exercisers, with a 10mm/.39" ball. The purpose of this is to make it easier for the user to find the ball in his or her mouth and practice moving the ball in the desired direction, depending on the exercise being performed.
For some users the Letsip® K-series can fully replace oral motor exercising plates for strengthening the tip of the tongue and lateral movement of the tongue.
The K-series can strengthen the tongue before articulation training. The different sounds created with the tip of the tongue (e.g. L, N and R), at the roof of the mouth (e.g. D and T) and with the mouth closed (e.g. B, P and M), can all become better with the use of K-series.
The K-series can contribute to a better lift of the tip of the tongue and give exercise at lateral movement, thus improving eating, mastication, chewing et.c.