PLEASE NOTE:These are real pen knives, so they must be handled carefully when open. Because of this, we can only sell them to people under 18 years of age with parental permission. EFFECT: A small pocket knife suddenly changes colors from (for example) White to Red and back again at your command. A classic of magic, available at your fingertips! These knives are pocket friendly and easy-to-handle. These are Merrill-Style knives and as such are pretty flat, but instead of covers rounded on the edge like the Enardoe Knives, they were fairly square. The squareness aids in performing the color changing moves and made these knives very desirable. These knives were made in the same Pakistan factory as the 2nd generation Merrill knives, so share the same, good handling features. They come in a velvety bag, with instructions.