The Cerro Dragon oilfield, operated by Pan American Energy, has producing oil wells that use rod pumping systems with average depths of 2,440 in (8,000 ft) and fluid rates as high as 200 m(3)/d (1,300 bfpd). In this oilfield, the pulling operations exhibited a high incidence of pin breaks, generally located in the 22.23 min (7/8 in) OD taper that we concluded to be the weakest part of the entire string, as we will show. In order to solve this problem, a new sucker rods design was developed by creating a new non-API 22.23 mm (7/8 in) sucker rod with ends of 25.4 mm (1 in) in order to reinforce the string. This technical work describes the development of this technology, as well as the experience in the field, with excellent results up to the present.