All our brushes are made from synthetic fibre with a wooden handle. The thin bristles allow for precise lines and detailed drawing.. Size 7 - This is a thin liner brush with long hair, great for graphic looks!. Size 7.5 - This is a thin liner brush with long hair, great for graphic continuous lines!. Size 8 - The perfect liner brush for those long continuous strokes!. Size 9 - Our longest and thinnest brush of all!. THIS IS A CRUELTY FREE AND VEGAN PRODUCT!