1, They are perfect for timing cooking, games, exercising and so on.
2, Prices are based on one set which include 6 pieces, that are: 30 seconds, 1 minute, 2 minute,3 minutes, 5 minutes, 10 minutes.
3, Material: plastic+glass+sand.
4, Case color is either single or assorted.
Note: This is a sand timer made for games. It is not a precision timing device, so there is time deviation.