Restoration set consisting of 4 steel wool brushes, made in France This set of 4 steel wool brushes is a great addition to your cleaning toolbox. We do recommend being very careful when cleaning copper-based items, as it is probably the most "sensitive" or softest metal. More versatile than other pencil sets you may find online! Lighter, thinner and longer than other pencils with longer fittings. These will also last longer while being more comfortable to use. Ideal on bronze coins such as ancient Roman Coins, US Indian Head Pennies or 2-cent pieces. Perfect for cleaning bronze coins and artifacts found while metal detecting Directions and recommendations: 1. The pencils should be used in circular motions. Start gently and then figure what amount of pressure is appropriate. 2. These should NOT be used in conjunction with liquid cleaners. The steel wool rusts easily so you should keep these pencils dry at all times. 3. These pencils allow you to scratch without damaging anything or removing the patina.