Only the Peter Hess® Singing Bowls that receive the Therapy Quality label are suitable for therapeutic use. Peter Hess® Therapy Singing Bowls are forged from a cast blank. The elaborate forging technique ensures that they vibrate much longer and more evenly. Even if a good pre-selection already takes place in the production countries Nepal and India, some bowls do not meet the requirements for the quality seal “Peter Hess® Therapy Singing Bowl – professional therapeutic quality”. Therefore, all singing bowls are again intensively tested for quality in Germany.