These Sure Grip Beaker Drinking Lids have been specifically designed for use with the Sure Grip range of cups & beakers. These drinking versions have a 4mm wide drinking spout which is perfect for use with both hot & cold fluids. A clever valve in the top of the lids helps to create a vacuum inside the beakers which allows the user to control the flow of the liquid & reduces the effort required to suck, even allowing the beakers to be used whilst lying down. These lidsare very easy to use & fix securely into the Sure Grip Beakers giving a watertight seal without the need for screwing in, thus reducing the risk of bacteria gathering in the nooks & crannies of a screw thread. Small 4mm spout ideal for hot & cold fluids Fits all Sure Grip Beakers Allows user to control flow Reduces force required to suck Can be used when lying down Lid weight: 25 gms (each)