All of HanZhen company?s harmonic drives fall under two principal categories, both derivatives of XB1 and XB2, which differ from one another in terms of their respective drive structures. Harmonic drive under the XB1 employs cuppy flex spline structure.XB1 Serial products are capable of providing a range of 10~10^3 speed ratio. XB2 utilizes the tubby flex spline structure. The principal feature of the serial products lies in the wide range of output speed ratio from 10^2 to 10^5. Comparing with other companies? products, our company products have following features: 1. Easily accomplish the drives at various speed ratio grades between 300 and 2000. 2. The manufacturing technique of the cam modeled according to varied grades, which is exclusively held by HanZhen Company, has effectively improved the processing precision of a wave generator 3. It is ensured that harmonic drives can run an average of over 10000 hours in one stretch without failure, provided that the equipment prescribed load not be exceeded.