Copper works great for just about any situation. It is tough, ages well, and is less expensive than the silver tools. If copper is in contact with the skin for a period time, the skin of some people may temporary become green due to the copper retracting and trying to absorb into the skin. Some say that the green mark could be an indication that the body is dehydrated, stressed, or too acidic. When your body is in balance, the copper will be absorbed and processed by the body more quickly and should not leave a mark. Copper is a vital nutrient that is needed for proper cell function. Silver, on the other hand, should not leave a mark and has been said to work smoother and faster in some cases. It also carries a slight feminine quality to it. If you feel pulled towards the copper tools, then choose copper. If you feel pulled towards the silver tools, then choose silver.