From the ChiaoGoo website:
Our 4″ (10cm) TWIST MINI interchangeable set comes with five solid stainless steel tip sizes US000 (1.5 mm) to US1.5 (2.5 mm), three cable lengths to make 16″ (40 cm), 22″ (56 cm) and 30″ (76 cm) circulars and all the little parts and pieces. This next generation MINI has two tightening holes to ensure an even more secure connection.
The 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.
Set includes 1.5-2.5 mm/US 000-1.5 sized needle tips.