The AUSGEL red series barrels feature 9.5mm outside diameter which fits the majority of t-pieces from brands such as Jinming, CYMA and LDT.  With a 7.5mm inside diameter these barrels will work with all of the AUSGEL range of gel balls.

These barrels are not compatible with WELL or Lehui brand blasters, for these you will need to purchase an AUSGEL blue or purple series barrel respectively