This set of tools helps paint perfectly round irises and pupils of varying controllable sizes. Using enamel or acrylic paints that come in a jar, stir the paint thoroughly. Shake the jar. Remove the lid from the jar. A thin film of paint will stick to the upside-down lid. Daub the end of a paint tool in the film of paint and apply to the head of your fly. This can be an iris. Let it dry. Use a smaller tool and darker paint for the pupil. Tool heads are six different diameters.