Feature 1Made of high quality rubber material, corrosion resistant, safe and durable to use. 2Easy and convenient to use, help pipettes to draw liquid rubber ball. 3Suction ball has 3 openings which are used by elastic rubber force to help suck the solution into the pipette. 4Be careful not to draw the solution into the ball. 5Safe 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. 6The absorption of the liquid can be controlled by the existence or absence of this interspace.SpecificationCondition: 100% NewItem Type: Quantitative Suction BulbMaterial: RubberColor: RedA Opening Diameter: Approx. 11.2mm / 0.44inHole Diameter: Approx. 5.7mm / 0.22inE Opening Diameter: Approx. 12.8mm / 0.50inHole Diameter: Approx. 7.6mm / 0.30inS Opening Diameter: Approx. 14.4mm / 0.57inHole Diameter: Approx. 7.1mm / 0.28inWeight: Approx. 46g / 1.6oz.w-e-text table td,.w-e-text table th,.wang-edit-text table td, .wang-edit-text table th{border: .5pt solid 000;};.w-e-text table,.wang-edit-text table{border: 1px solid 000 important;}Package List1 x Quantitative Suction Bulb