This trio sand timer is a sort of tea timer, and some customers call it coffee timer as well. The three normal hourglasses are assembled between the two round wood plates. So it’s also a kind of 3-in-1 hourglass. It’s not big, just Dia 5.5 * H 9 cm. The wood frames are totally round, and this is a little different from the other 3-in-1 sand timers. The maximum flowing time is 5 minutes, and we can make the hourglasses with different times. Such as 1, 3, 5 minutes as a group, and this is one of the best groups.