The performance of molded polymer gears continues to improve with new design solutions, improved materials, and higher accuracy molding. As a result, medical designers now use them more to solve challenging product requirements, especially with regard to miniature and micro-miniature mechanisms. Plastic gears can provide a high torque, high speed, cost effective solution for a host of needs. Kleiss Gears currently produces miniature gears that spin at 200,000 RPM, gear trains of 1200:1 reduction ratio that are the size of a thumb tip, and metering devices for disposable delivery systems worn by the patient and necessarily quite small. A manufacturer would find it difficult if not impossible to achieve such applications with cut metal gears, and cost would be exorbitant.