3 brush set:Foxtail brushAir Stem brushFilter Stem BrushThe Hagen Marina Cleaning Brush Kit is equipped with three cleaning brushes. The foxtail brush is ideal for cleaning tubes up to 1" (2,54 cm) in diameter and 18" (45 cm) in length. The airline brush is specifically designed for cleaning airline tubing. The filter stem brush is great for cleaning external filter tubes as well as clip-on filter intake stems.