CLOAK SERIES SUPPRESSOR FOAM INSERT KITSCloak Series kits are made from high quality Auralex sound foam and are created from hundreds of hours of testing to provide you with the best suppression in the Airsoft world. They use a multiport multistage design that diminishes the sound created by the rapid release of air and sound from the end of the barrel. Suppressor length or specific kit : 6 9 inch suppressor kit diameter : 30. 5 31. 5 mm