Rock City (China) industrial Co., LTD.  is a professional joint venture for computer and printer consume materials .Its  manufacturing base ,located in Longgang Distract of Shenzhen city,has three advanced ink cartridge lines and two toner cartridge lines. The company specializes in ink cartridge and toner cartridge. Welcome for contact for more detailed information .We do hope to estabilish a mutual benefit business relationship with your esteemed company in the future.