Rimba Bondage Play metal penis plug. The plug is hollow inside allowing moisture to come out. The penis plug has an increasing diameter from 5 mm to 1 cm and can be inserted for over 8.5 cm. The ring at the top makes it easy to remove the plug. This bondage accessory can be used with any typelubricantand is best cleaned under the faucet with a mild soap, then dry and polish with a clean cloth.