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Laboratory Precision: stonylab rubber dust balls facilitate meticulous volumetric measurements and transfers, with a calibrated 30 ml capacity for exact liquid handling Resilient Rubber Build: crafted from supple rubber, these bulbs bounce back to shape after compression and are designed to last through many uses in lab settings Multi-Pack for Lab Efficiency: the set includes three rubber blow pumps, making it easy to dedicate each one to different tasks or solutions, enhancing lab productivity Operational Advisory: for optimal performance, users should avoid over-compression to prevent the unintended intake of liquids into the bulb’s interior Warranty: StonyLab 1-year limited warranty; if received damaged, please contact us immediately; we will solve it until satisfied