Features:_x000D_ _x000D_ Made of natural rubber, corrosion resistant, safe and durable to use. _x000D_ Suction ball has three valves which are used by elastic rubber force to help suck the solution into the pipette. _x000D_ Large suction force, not easy to crack, and the liquid is not easy to precipitate. _x000D_ Use with pipette, a good laboratory assistant. _x000D_ Suitable for industrial and mineral laboratories, agricultural laboratories, food laboratories, chemical laboratories and so on. _x000D_ _x000D_ Specification:_x000D_ Material: Rubber_x000D_ Weight: 47g/1.7oz_x000D_ Color: Red, Green (Optional)_x000D_ Size: 13*6*6cm/5.1*2.4*2.4inch_x000D_ _x000D_ Package List:_x000D_ 1 x Rubber Suction Bulb_x000D_ _x000D_ Note:_x000D_ 1. This product is only one-time use. _x000D_ 2. Products should avoid rain and snow leaching, should be kept clean, prohibit the contact with acid, alkali, oil, organic solvent and other substances, and distance from the heat source 1.5 meters away. _x000D_ 3. This product should be stored in a dry and ventilated warehouse, the temperature is 0-35 , relative humidity is not greater than 80%, and the ground 0.2 cm above. _x000D_ 4. The term of validity of this product shall be five years according to the above conditions.