ASFOUR Crystal piece is guaranteed to never change color & to contain absolutely no blurs, bubbles or streaks. It will never change colour & its sheen & spectrum of light & colors will remain luminous & radiant for life. ASFOUR crystals are forever. 38mm=1.5 inches long 30% leaded crystal #432-38 38mm Asfour U-Drop Icicle Crystal Prism Sun Catchers #432-38