I wouldn't normally take my whiskey with a twist, but if it's an Ashcroft Twist whiskey glass providing the service rather than a slice of citrus...you could probably twist my arm.
Sold as a set of two Ashcroft's curvy tumblers look like the very beginning of what I used to do to my Stretch Armstrong (I could get about 8 twists in before the rubber, or whatever he's made of, stopped giving.) Their added texture and illusion of movement within the glass itself make the Twist glasses distinctive additions to home bars and nightcaps.
Twist whiskey glasses hold your booze lead-free within ultra-clear walls. The mouth of each measures 3.3", which is large enough to fit standard 2" ice stones, whiskey balls, or cubes.