The material determines how the stick absorbs shock and how long it lasts: Guide to Drumsticks - Andertons Music Co.
Lower numbers actually mean thicker sticks. A 2 is thick and heavy, while a 7 is thin and light. The Letter (Application): buy drumsticks online
If you're a beginner, start with a 5A Hickory stick. It is the industry standard "middle ground" for almost any genre. 2. Choose Your Wood Wisely The material determines how the stick absorbs shock