Type3 CNG Cylinders are of an aluminum liner and carbon fiber fully-wrapped composite design. The Type 3 design is higher cost than Type 2, but much lighter weight. Type 3 is very popular in North America and China. The cylinders are designed and manufactured to the ANSI NGV 2 — 2007 & FMVSS — 304, ECE R110, ISO 11439, ISO11119-2.