A mouth spreader set contains 5 pieces of sizes S, M and L. Made of medical grade polycarbonate. The edges are rounded and comfortable to wear.Originally used in dentistry, these mouth openers inspired a hilarious game that quickly became popular on the internet.C-shape design, ergonomic handling, high anastomosis with the mouth. High temperature resistance up to 134 degrees.Great fun with these mouth spreaders. Put one in your mouth and try to pronounce any sentence. Can your partner understand what you are saying when you can't move your lips?Function: Fun entertainment for family and friends at parties. Desired mouthpieces for the challenge game in which you have to pronounce sentences. Perfect for both professional and personal use.