80% of our customers should get an SR.  Our best advice is to go with a model within the Series SR. Series SR flex shaft motors are 1/6 HP, run in forward and reverse at speeds up to 18,000 RPM, and offer all of the power and speed needed to accomplish most every job. Keep in mind that our motors are rated at continuous duty or maximum efficiency and NOT maximum output. If we adopted the max output rating used by other manufacturers, it would qualify as 1/5 or 1/4HP. Two Year Limited Warranty on Motor and Control.  This set includes C.FCT-1 Speed Control, which is Foredom’s most popular speed control. It features solid state circuitry in a heavy duty plastic housing with an extra wide footprint, low profile, and non-skid pads on the bottom. It provides smooth control throughout the entire speed range. (CSA listed. 7-1/4″ long, 4-1/2″ wide, 2-1/2″ high; ship wt 2 lb/1 kg.)  Handpiece sold separately.   Please call us for additional Foredom items or parts not listed on this website.