Dental high&low-speed handpieces in our company have two series-- J and M series for your choice. Other accessories are exactly the same except the bearings. Under normal use dental handpiece enjoy three- months free warranty, please rest assured of purchase. Model J-TF M-TF Cartridge Cartridge A grade(UK Barden bearing) Cartridge B grade(Japanese bearing) Description torque?push button?optical fiber?high-speed turbine handpiece Supple air pressure 177-216KPa (1.8-2.2kgf/C?) Rotation speed 310-350krpm Gross weight 0.2kg Head height 12.3mm Head diameter F12.9mm Chuck type Screw type Bur applicable Bur key, standard bur Accessories wrench Characters 1.Equipped with optical vitreous lighting, withstand repeated high-temperature, high pressure disinfection, the transmission rate is high.. 2. Suction-back system can effectively prevent blood, bacteria and other foreign body through the head into the handpiece