Feature 1 Made of high-quality rubber material, resistant to corrosion, safe and durable for use. 2 Easy and convenient to use, helps pipettes in drawing liquid using the rubber ball. 3 The suction ball has 3 openings that utilize elastic rubber force to assist in drawing the solution into the pipette. 4 Be cautious to avoid drawing the solution into the ball. 5 Safe, as each opening of the ball contains a small ball in the rubber tube; pressing on the side of the ball creates gaps that allow air to escape. 6 The absorption of the liquid can be controlled by the presence or absence of this gap. Specification Condition: 100% 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