Set of 3 contains the Large, Medium, Fibre-tipped Caran d'Ache Museum Water Brush. The Caran d'Ache Museum Water Brush has the unique feature of a plunger for filling the water reservoir. The overall construction is excellent and the brush has a very nice feel to it. Great for watercolor while traveling. This is a great accessory for watercolor pencils and water-soluble pastels.