ARK's Lip Blok® prevents individuals from biting the straw and/or inserting the straw too far into the mouth. Use these mouthpieces to discourage tongue-thrusting, to promote tongue retraction, and to correct overall tongue position. They can also be helpful with tensing for controlled lip and tongue movement. Try varying the liquid consistencies to supplement your other intervention strategies for increasing sensory awareness, symmetry, coordination, graded control for liquids, jaw stability, and lip, tongue, and cheek function. The Lip Blok® fits into any regular straw and comes in three different lengths - 1/4", 1/2", and the standard 3/4". They are also available in a flexible material (firm and soft) that allows you to cut them to any desired length. This kit includes one of each of the following Lip Bloks™ 1⁄2” (blue), and 1⁄4” (turquoise) and flexible (burgundy, and gradually trim the stem over time). Cups and straws sold separately. Each Lip Blok® is constructed of medical grade materials that are FDA compliant and contain no lead, phthalates, PVC, BPA, or latex. Made in the USA Caution: Use of these products should be supervised at all times.