we are miniature bearings factory , manufacture the inner size from 1mm up to 20mm bearings.specialized in inch and metric series miniature bearings.all our bearings are designe and made strictly under national GB/T 307.1 standard system.we also sale thrust bearing and one way material of our bearings have chrome steel and stanless steel, we have carbon steel also.all our bearings can used in sphere wheel , model and fishing are well known for their high speed , low noise and long life etc.By the way, we have quickly delivery , usually we can send bearing within 3-10days.