Features Suction ball has 3 openings which are used by elastic rubber force to help suck the solution into the pipette. Easy and convenient to use, help pipettes to draw liquid rubber ball. Safe in the opening of each ball has a small ball in the rubber tube, as long as the side of the ball can be pressed between the ball and rubber tube to form gaps between the air and out. Be careful not to draw the solution into the ball. Made of high quality rubber material, corrosion resistant, safe and durable to use. Feature: 1. 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