Brand New Black 6 Stage Tactical Expansion Chamber Mag. This will actually fit all paintball markers with a standard asa. So you can install it on Spyders, Icons, Tippmanns, etc. An expansion chamber allows the liquid CO2 to expand to a gas before it enters your marker. It will keep spiking down and your gun from freezing up and plus it looks awesome. You will need the vertical adapter which is not included if installing this on a tippmann 98. If installing on a Tippmann A5 Marker will also need a different length steel braided hose.