Type 00 flour is a finely refined flour in the Italian classification system. The designation describes refinement and ash content; it does not specify a single protein percentage or guarantee suitability for every bread or pasta. Check the producer's intended use.
Pizza formulas may call for a strong 00 flour, while other 00 products suit different applications. It is not automatically equivalent to cake flour, and changing flour can change water absorption and dough handling.
Reference: Further reading.