Thomastik Cello rosin is good for student palyers as well as professional level.Rosins are produced in assorted qualities and compositions to fit each different artist, as well as to suit different climate conditions.Thomastik tropical rosin, which is made for use in hotter climates, is only available in one grade of hardness. Bow resin include special ingredients and manufacturing methods to heighten the bow's ability to interact with the string surface.