Octave: 4 Frequency: 327.5Hz Avg Rim Thickness: 2.4mm This Clear Handle Crystal Singing Bowl includes a suede-wrapped mallet. Crystal Vibes Clear Handle Crystal Singing Bowls are crafted from optically clear quartz that is 99.999% pure. This bowl exhibits incredible sustain and has no equal in the world of quartz musical instruments. **Silicone mallets suggested for hollow handle singing bowls. **Purchase silicone mallets separately from HK Faire catalog. "Products with retail prices over $500 are not returnable to Faire. They must be returned directly to HK Higher Knowing and will be charged a 20% restocking fee and the retailer is responsible for covering all shipping costs back to HK and the warehouse. Products returned to HK must be in original packaging and condition, packed very well, and include all the items shipped initially. Missing items will be charged directly, and the order refund will be held until all items are returned or paid for in full to HK."