Specification Brand : Generic BulletPoint1 : Suction ball has 3 openings which are used by elastic rubber force to help suck the solution into the pipette. BulletPoint2 : Made of rubber material, , and to use. BulletPoint3 : Easy and convenient to use, help pipettes to draw liquid rubber ball. BulletPoint4 : 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. BulletPoint5 : Be careful not to draw the solution into the ball. Color : Blue IncludedComponents : No ItemDisplayDimensions_Length : 5.51 inches ItemDisplayWeight : 0.1 pounds ItemName : Rubber Lab Supplies Red Quantitative Suction Bulb, Quantitative Pipetting Ball, Experiment for Student ItemPackageDimensions_Height : 6 centimeters ItemPackageDimensions_Length : 15 centimeters ItemPackageDimensions_Width : 10 centimeters ItemTypeKeyword : science-lab-pipettor-accessories ItemVolume : 504 cubic_centimeters Manufacturer : Generic Material : silicone ModelNumber : Generic61gdwh4yqb NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : Generic61gdwh4yqb ProductDescription : 1. Made of rubber material, , and to use. 2. Easy and convenient to use, help pipettes to draw liquid rubber ball. 3. Suction ball has 3 openings which are used by elastic rubber force to help suck the solution into the pipette. 4. Be careful not to draw the solution into the ball. 5. 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. 6. The absorption of the liquid can be controlled by the existence or absence of this interspace.