Features E-A-Rform™ tip and blue stem. Metal detectable models feature no roll-down design and a flexible stem. Grip ring models feature cone shape and built-in grip rings. ComforTip™ models feature shape curves, wide base and no roll-down design. SofTouch™ model features ergonomic insertion "pistol-grip" stem and soft tip. Test compatible with 3M™ E-A-Rfit™ Validation System.