PersonaGrip helps users design their human-machine interface according to THEIR criteria. Forcing functions driving design include: grip-force reduction, maximizing comfort, mental transparency for maximizing feedback, vibration reduction, injury compensation, ingress/egress or approach/departure, surface texture, dual-durometer material optimization, tool protection, injury prevention, workers injury compensation, recent surgery adaptation, hand movement, shared tool or multi-driver, ambient operating temperature, and many other factors. PersonaGrip pioneered the use of dual-durometer, high-melt-index thermoplastics in ergonomics. Workers in factories around the globe have hired Dellis, its inventor, to adapt assembly line tools to reduce injuries and while maintain productivity and improving profitability through reduced downtime and worker retraining. On racing circuits, Dellis is known as The Steering Wheel Guy, and his work can be found in these drivers' hands: Emerson Fittipladi, Michael Schumacher, Nigel Mansell, Jacques Villeneuve, Bill & Mike Seebold, Dave Villwock, Geoff Bodine, Loy Allan, Dale Jarrett, and many more.