The perfect training set for ball gag beginners!This 4-part ball gag set includes an adjustable head strap and three interchangeable ball gags in sizes S, M and L, making it also an attractive set for people who are experienced with gagging one another. Each ball gag has holes to breathe through. Couples should start with the smallest ball gag and gradually work their way up to the larger gags until they have reached the largest one. The ball gags can be exchanged quick and easy using the press studs on the head strap.Polyvinyl chloride, ABS, metal.