The shape and size of the brush depends on the type of stroke or effect you want to achieve. The most common shapes are round, flat, cat tongue, fan and liner or script. The round is the most versatile and is used for all types of motifs. The flat is used for painting backgrounds, skies or flat surfaces. The cat's tongue is used to paint leaves, petals or fruits. The fan is used to create textured effects, such as grass, hair or feathers. The liner or script is used to paint lines, branches, stems or letters. Sizes are indicated by a number from 0 to 24, with 0 being the smallest and 24 the largest. The size of the brush influences the amount of water and paint it can hold, as well as the precision and coverage it can achieve.