The set, from the company Kraft&Dele, consists of 419 O-Rings sorted into practical drawers. They come in a case with drawers, each of which has a label with the type of O-Ring it contains, so you know its contents.

The O-Rings have high resistance to: engine and heating oils, greases, hydraulic fluids, alcohols, oil-water emulsions hsa and hsb, polyglycol-water mixtures type hsc, aqueous salt solutions, diluted acids and bases at low temperatures, water up to 90°C, etc.