Rimba Bondage Play metal penis plug with a ribbed design. The plug is hollow on the inside so that moisture can come out. The penis plug has a diameter of 0.9 cm and can be inserted into the urethra for over 12 cm. It is made of non-magnetic stainless steel. Afterwards, it is important to clean this plug properly. This can be done with a clean cloth, some mild soap and lukewarm water.