The straw has a weight which ensures comfortable drinking regardless of the angle that the cup is being tilted at. It also has a mouthpiece with a unique leakproof valve which has an anti-colic function. Suitable for children over the age of 6 months. BPA free. Suitable for dishwasher use. The product consists of a straw, a weight (food-grade silicone) and a straw connector (PP), which are resistant to temperatures from -20°C to 110°C. Each set includes two straws. Before the first use, unblock the valve by pressing on the mouthpiece. In order to enable the flow of liquid, push on the valve.