This is an excellent assortment of some of the most commonly used Poly Labware items. Kit consists of 20 items shipped in a convenient storage box. Personally, we use Poly Labware for almost all our work. The only time we resort to glassware is when heating is required. The Poly Labware containers pour better, and are certainly less expensive... not to mention unbreakable. They are ideal for field work where glassware is too fragile to be used or transported.