Unlimited Song of the Spine Tuning Fork Set (Weighted) with ActivatorThis listing comes with a set of 12 weighted tuning forks and an activator. Note: These tuning forks are made of aluminum, which is a soft metal, great for harmonics and sound healing. Because of this softness, you might find the occasional small mark or scratch. The fork isnt damaged, nor is the tuning off. It can happen during packing by the manufacturer, or during shipping and handling. We provide safe storage and great care when handling them. Dr.