The sets are made with a stainless steel structure for 3 or 12 dishes. This structure is resistant against acids and solvents and can easily be washed. The design is light constructed so you can move it with two hands. The set includes the metal holder, the dishes (300 ml capacity each) with attached lids (code 10-30) and a slide staining holder with plastic handle for 25 slides (code 1 0-42).