Lead Crystal is quite simply the finest glass product currently manufactured today for guitar slides. Slightly softer in structure than commercial soda-lime bottle glass, the addition of lead oxides (colored pigments) into the basic glass 'mix' allows for the beautiful colorings and a pure tonal clarity, with a resonance totally unmatched by any other glass slide product available.
These lead oxides added to the glass 'mix' (our U.K. glassblowers use a common 24% lead/silicate split) allow the player to use a thinner wall-thickness crystal slide, giving a superior tonal advantage and sustain over & above any available thicker-walled soda-lime & Pyrex glass slide....perfect for electric slide/lead players to fly around the fingerboard!
As you move up to a heavier, thicker-walled lead crystal glass slide, the overtones become noticeably more fuller and more resonant, with sweet, smooth sustain and a warm 'liquid' tone...perfect for wood-bodied acoustic & resonator instruments.