The 4th 251 Most Common Chinese Characters is the fourth book of a set that covers the first 1000 most common characters. Each book includes all the strokes, all the rules of stroke order, the 214 Kangxi Radicals, and the Rules of Pinyin and pronunciation. There are over 350 pages of practice drills. This is a work book based on the my first book, "Hanzi and the Kangxi Radicals".