From the ChiaoGoo website:
Our TWIST MINI interchangeable set comes with five tip sizes US000 (1.5mm) to US1.5 (2.5mm), three cable lengths to make 24″ (60cm), 32″ (80cm) and 40″ (100cm) circulars and all the little parts and pieces. This set comes in a compact, black mesh pouch and includes a sleeve to store your tips in. The MINI system is not compatible with our other Small [S] or Large [L] interchangeable systems without the use of one or both of our adapters. Item #7500-M
Set includes 1.5-2.5 mm/US 000-1.5 sized needle tips.