Trainings within the Kostka Nail System brand are conducted as exclusive Master Class seminars, designed for professionals who seek the highest level of technical and artistic advancement.

Bojana Kostka, founder and owner of the KNS brand, is the author and developer of the Casting Technique and all extreme nail forms taught within the program. The seminars are available in both individual and group formats, with a clearly structured curriculum, a high level of dedication, and a precisely defined methodology.

The focus is not only on mastering technique, but also on developing creativity, innovative use of materials, and building a unique artistic identity.

KNS Master Class represents a space where technique is elevated to the level of art.