... by volume of components : 100% GlassIngredient: soda-lime glass, free of leadFeature: bright looking, smooth touch, solid ... but necessary lines and bubblesProduction process: gathering, preparing, mould blowing, footed, annealing, cutting, edging, grinding, polishing, quality ... inner strength - resulted from annealing process, bad glass with unsufficient annealing has more inner strength, thus much ...