Tempered glass slides are preferred for full rich tones. They sound warmer and more resonant than metal slides, producing smooth transitions with minimal string noise. Tempered glass slides are the top choice for many acoustic players, and they're also favored by electric players who want to purest slide tones possible. The 203 is a large slide that fits a size 12.5 ring finger, is 69mm in length, has a 1.5mm wall and the inside ring is 22mm. Made in the USA.