Features Pressing: There is a small ball in the rubber tube at the opening of each ball of the pipetting ball. As long as one side of the ball is pressed between the ball and the rubber tube to form a gap, the air can be discharged. 3 Openings: The suction bulb has 3 openings, which use the elastic rubber force to help suck the solution into the pipette, which is a very useful auxiliary tool. Pick up Liquid Transfer: the use of pipetting ball is simple and convenient, it is a rubber ball that helps the pipette to absorb liquid. Use: The suction red ball can be used for the absorption of liquid, which can be controlled by the presence or absence of this gap, be careful not to suck the solution into the ball. Selected Rubber Material: The quantitative suction red ball is made of selected rubber material, which is soft and tough, safe and durable to use. Feature: The absorption of the liquid can be controlled by the existence or absence of this interspace. Specification: Condition: 100% Brand New Item Type: Quantitative Suction Bulb Material: Rubber Color: Red A Opening Diameter: Approx. 11.2mm / 0.44in Hole Diameter: Approx. 5.7mm / 0.22in E Opening Diameter: Approx. 12.8mm / 0.50in Hole Diameter: Approx. 7.6mm / 0.30in S Opening Diameter: Approx. 14.4mm / 0.57in Hole Diameter: Approx. 7.1mm / 0.28in Weight: Approx. 46g / 1.6oz Package List: 1 x Quantitative Suction Bulb Package List 1 x Quantitative Suction Bulb