Clear Quartz - known as the master healer, will amplify energy and thought as well as the effect of other crystals. Draws off negative energy, and strengthens your alignment with higher self. Great for mediation and healing work. Safe Material - 18/8 (304) food grade stainless steel + 100% natural crystal. The straw unscrews into two pieces for cleaning. Cleaning brush included. Dimension - Straw length: 7.9". Crystal size: Length about 1.65”-1.7”(42-43mm)/ Width about 0.98”(25mm). Please note that crystals are natural, each stone may vary slightly with shape, size, color and transparency, each crystal is different and unique.