These brushes are the smallest MAESTRO Kolinsky detail brushes made. This line features an extra short, finely shaped hexagonal handle that fits perfectly into the hand. The mini handle format is great for precision painting, retouching, modeling, restoration or spot painting. The MAESTRO designation denotes the highest quality winter male Kolinsky Red Sable hair from the Tobol River region in Eastern Siberia. The handles are from sustainable European forests in the Baltic States. Each brush is expertly hand crafted by da Vinci's most skilled brush makers in Germany at the family-owned factory. This set includes Series 100 Size -20, -15, -10 and -5.