These new style pipet fillers allow for true one hand operation. They use only two pinch points versus the stand three you'll find on standard pipet fillers. You can even clean inside the bulb due to the removable valve. Each filler is made of 100% natural rubber and can pipet up to 50 mL's. They have a 1/4" diameter opening to fit the majority of pipet's on the market today and come in a variety of colors. Natural rubber pipet fillers are excellent for transferring corrosive, toxic or sterile liquids safely. For more chemical resistant needs try our Silicone Pipet Filler. Made in Germany.Sold as: Each