Boys are 5.9 to 5.0 meters and girls are 3.8 to 2.5 meters. According to official website, Hangzhou Education Bureau, the grading standard of solid ball in grade three of primary school is 5.9 to 5.0 meters for boys and 3.8 to 2.5 meters for girls. The grades are divided into four grades: excellent, good, passing and failing. Solid ball is a kind of sports equipment, which is made of solid material and spherical. At the same time, it is also a kind of sport, emphasizing strength and speed. In some areas, the score of "throwing a solid ball" was included in the senior high school entrance examination.