You can feel the difference using our new Stainless steel array. Other competitors sell cheap Carbon steel array that feel generic and don't work as powerful as ours. Our Detox Arrays use 11 stainless steel coils. You can truly feel the difference using our new stainless steel arrays. Other competitors will sell cheap steel arrays that feel generic and dont work as powerful as ours. The Stainless steel detox arrays are durable between around 30-50 uses each, depending on care. The round detox array is standard size and are compatible with most ionic foot bath machines.