The Deluxe Yeast Starter Kit comes with ingredients and instructions for making a 2L yeast starter (yeast not included). Yeast starters are beneficial for any beer or style, but they're highly recommended for higher alcohol beers and cold fermenting lagers.
In the lab world, these flasks are known as "Student Grade". A great flask for making yeast starters! (Student grade is not the highest grade flasks and will have minor defects)