we are  manufacturer specializing in producing Dental handpiece and Dental Units in China.
We have been in this industry for over 7 years, please have a look at our website:  www.dental-apple.net  or http://handpiece.en.made-in-china.com/ You will find there are many products same as the ones you displayed.
In addition, we have a very professional Quality Control, Engineering and Design community, and have passed CE, ISO:13485 and FDA certificate.
Any inquiries on dental equipment, please do not hesitate to contact us.