Heavy duty polyethylene. The complete system comprises a basket which holds the items to be cleaned and fits inside the soaking jar. After soaking the basket is transferred to the siphoning rinser which is connected to a mains water supply. The fill/drain siphoning cycle repeats automatically for as long as the rinsing water flows at the correct rate. Requires a source of mains water and a suitable waste water drain. For pipettes and burettes up to 600mm long.