This guitar slides has excellent texture, smooth feeling. The surface is smooth and unflawed, can touch the strings more gently and produce a crisp, persistent, warm sound that resonates. It is the best choice for ballad and electric guitar. Features: Metal guitar slide: made of 304 stainless steel with good quality. Can offer superior sustain, excellent intonation, and a clear bright sound. Clear glass slide: made of seamless pyrex glass and processed from good quality boron silicate. Slip smoothly on the strings, make much softer, subtler, harmonics sounds. Slide bar is a kind of guitar playing skills to increase control or make guitar playing feeling richer timbre. Suitable for playing guitar, banjo, ukulele or other stringed instrument. Specifications: Material: metal/glass Color: gold; silver; black; transparent (optional) Item Size(Length * Outer Diameter * Inner Diameter * Thickness):      gold & silver & black: 60 * 25 * 21 * 2mm     transperant: 60 * 25.2 * 21 * 2.1mm Package Weight:     gold & silver & black: 65g / 2.29ounce     transperant: 15g / 0.53ounce Package Size: 60 * 25 * 25mm / 2.36 * 0.98 * 0.98in Notes: 1. Please allow 1-10mm error due to manual measurement, thanks for your understanding! 2. The guitar showed in the picture is not included. Package List: 1 * Guitar Slide