Put the water below 15 degrees into the color changing cups, the color of the body of the cups will change automatically. This product has a fixed ring design, which straw won't out slip easily and the concave and convex design at the bottom of the cup makes it more stable. Cup is made of high quality plastic and PP material. Cup height is 17.3cm, mouth diameter is 9.8cm and bottom diameter is 6cm. This water cup volume is 700ml. This water cup is suitable for travel, home, office, students, etc. Item Name: Water Cup Material: PP Capacity: 700ml Size Details: Mouth Diameter: 9.8cm/3.86" (Approx.) Bottom Diameter: 6.0cm/2.36" (Approx.) Height: 17.3cm/6.81" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Water Cup