Pipets are non-plugged and non-sterile, with a uniform pulled tip. Calibrated to deliver to the tip, with two rings near the top denoting that the small amount remaining in the tip after free delivery has ceased must be blown out and added to the main volume delivered. Provided with "negative" graduations to increase the versatility of the pipet. Made from borosilicate glass in compliance with ASTM Specification E438, Type I, Class B glass requirements. Bulk packed in sealed plastic bags and overpacked in shelf packs.