Silence the Obedient Sub That Youft.ve Trained with This Silicone Gag. The Top Quality Vegan PU Strap is Adjustable to Fit Between 16in. and 21in. Circumference and is Removable for Easy Cleaning. The Soft Plush Lining is Very Comfortable. Gold Accent Hardware Compliments the Red PU Well. Silicone Ball Has 46 mm Diameter.