As distinct from other flexible couplings, the new generation of NENFLEX spiders, the star shaped, the Wrap-Around and the individual free floating are the subject matter of a patent and a result of CAD analysis and practical dynamic test. The specially designed profile of the spider arm and the drive insert allows only a partial contact with the driver and the driven jaws at no load and 100% contact at nominal torque. There is less abrasion and heat build up which enhances the service life of the spider and also allows a larger load carrying capacity.

A variety of high performance polyurethane materials are available as optional materials for the spiders and drive inserts.