The rams are made from durable long lasting epoxy steel

mushroom shaped speaker fits directly into ear

Worn By Military Personnel Worldwide

Should you need to calibrate it

StatPacks G3+ Oxygen Module - Green Footwear Accessories The rams are made fromStatPacks G3+ Oxygen Module Green The Minimalist EMS Oxygen Module to Secure a D or Jumbo D Cylinder and Dramatically Prolong Pack Life The G3+ EMS oxygen module can be used as a standalone module or in other EMT jump bags. It incorporates perfectly into the Statpacks G3+ packs, effectively converting packs into bonafide O2 solutions. This is the ultimate must have accessory when carrying 02. Description Tank NOT included Module Only The G3+ oxygen