Although not constructed of copper, another option for use with copper rain gutters is the Gutter Foam Filter products. These are open cell foam shaped to fit the inside of the rain gutter and are available for both half-round and K-style rain gutters. The top of the foam material is level with the top of the gutter and is not visible from the ground. The foam is particularly effective in preventing virtually all foreign material from entering the rain gutter. The leaves and other debris will come to rest on top of the foam and be washed off by rain or blown off by wind.
To learn more about the Filter product check out: Contractors Filter Gutter Guards they have a 5 inch K style product that is perfect for both copper or aluminum gutters. This is a easy to do it yourself product that will save you money and work for years to come.