Model:
RT-RMKBL-D (Deep Groove Bearings)
RT-RMKBL (Angular Contact Bearings)
RT-RMKBL-G (Germany Myonic Angular Contact Bearings)

Quiet --- The rotor is balanced !

Long Life --- Build with Angular Contact Ceramic Ball Bearings !

Replacement part for MK Dent Basic Line large head push button part number TC2021
HC2001 / HC2002 / HC2011 / HC2012 / HC4011 / HC6011 from serial numbers beginning with F
HC4021M up to serial numbers beginning with E
HC4021K up to serial numbers beginning with F

About Bearings:

Deep Groove: Deep groove type ceramic bearings.
(The bearing works more than 6 month with good maintaining)

Agular Contact: The best Rito Dental Angular Contact Ceramic Ball Bearings.
(The bearing is Less Noise, works about 12 months with good maintaining)

Germany Bearing: Germany Myonic Angular Contact Ceramic Ball Bearings.
( The bearing is more quiet and stable, works more than 12 months with good maintaining)

DHL:   http://www.dhl.com/en.html   
EMS: http://www.ems.com.cn
TNT: http://www.tnt.com
FeDex:  http://www.fedex.com
UPS:  http://www.ups.com.cn
Yanwen Express:  http://www.yw56.com.cn   
Economic Air Mail :  https://www.17track.net/en