Ningbo Rongtor Electronics Co., Ltd., located in Ningbo, port cityin Zhejiang and established in 2012 (previously ZR Factory), is areliable professional speaker driver unit manufacturer. Our productmix includes: super tweeter, car speakers, diaphragm parts, T-yoke,U-yoke, washer, CNC series, etc. Rongtor can offer OEM/ODM servicesper customer needs. Our lead time is usually 20-45 days afterreceiving order. Rongtor has built a team of experienced designers,NC technicians and managing personnel. It is striving for fine andzero-defect products to ensure constant quality services.