The tunnel wants to be filled...!Hollow butt plug with a stopper that prevents the plug from slipping in too far. Perfect for refreshing enemas and games with a mini vibrator. Exclusive, transparent design made out of borosilicate glass. Holds up to 59 ml.Complete length 10.9 cm, width 6.7 cm, inner Ø 2.5 cm. Borosilicate glass.