These disposable glass pipets provide the performance of glass with the economy of plastic. Constructed of pharmaceutical, Type 1 borosilicate glass. pH change is reduced because pipets are chemically inert. Pipets will not warp or bow, and may be flamed. Baked-on graduations are resistant to solvents and stay visible even through the longest analysis. Calibrated ""to Deliver"" with blow-out. Two rings near the top indicate the last drop must be blown out after free delivery. Not sterile and not plugged. Furnished in bulk pack.