Features:_x000D_ _x000D_ Made of fine glass,durable and has long service life. _x000D_ Glass slider is a guitar playing skill for better performance. _x000D_ Glass sliders are very useful in guitar playing. _x000D_ The glass slider is a modification of the metal slider, lighter and more convenient to use. _x000D_ Glass sliders are mostly playing blues, country music. _x000D_ _x000D_ Specification:_x000D_ Color:Transparent_x000D_ Material:Glass_x000D_ Sliding Length(Optional):28mm/1.1in 51mm/2.01in 60mm/2.36in 70mm/2.76in_x000D_ Outer Diameter: 25mm/0.98in _x000D_ Inner Diameter: 21mm/0.83in_x000D_ _x000D_ Package List:_x000D_ 1*Glass Slid 1Made of fine glass,durable and has long service life. 2Glass slider is a guitar playing skill for better performance. 3Glass sliders are very useful in guitar playing. 4The glass slider is a modification of the metal slider, lighter and more convenient to use. 5Glass sliders are mostly playing blues, country music.