I only tried it on my finger once after purchasing it. I'm selling it because it didn't fit my finger size. JIM DUNLOP 202 PYREX GLASS SLIDE REGULAR/MEDIUM ■ Slide Bar ■ Regular (Thickness) / Medium (Inner Diameter Size) ■ Ring Size: Approximately 8 (Outer Circumference: 57mm) ■ 18 (Inner Diameter) x 22 (Outer Diameter) x 69 (Length) mm ■ Pyrex Glass Slide. This is the most popular slide currently, providing a warm tone. It uses high-quality Boron Silicate and is finished with a heat-treated, scratch-free tube. There are three types based on glass thickness: Heavy, Regular, and Medium.