The Delrin® Acetal glide with a glide holder that is rotationally moulded to the head for an airtight fit.
Most aftermarket Teflon guides used on traditional wands are designed to fit a wide variety of wands and often don’t fit well and need to be siliconed to the wand.
The Delrin glide is especially fit to the glide holder on the Evolution giving it an airtight seal and making it easily replaceable.