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These graduated large bulb type Samco Scientific disposable transfer pipets are made of shatterproof, nontoxic polyethylene. Non-sterile and bulk packed, the single-unit design features a stem which narrows down to a fine tip and a built-in pipet bulb eliminating the need for plugging. Especially useful where more accurate volume measurements are required, the graduation lines allow the accurate measurement of more than one volume. Their low-affinity surface reduces loss of cells and valuable proteins due to binding. They can also be frozen in liquid nitrogen or heat sealed for storage. Graduation Increments: 0.25 - 1.0ml. Overall Capacity: 5.8ml. Bulb Draw: 3.4ml. Dispensing Rate: 25 Drops/ml. Stem Diameter: 4.6mm. Length: 6-1/10 inches (15.5cm). Samco Scientific #: 222.