37 is a light grey from the Lana Grossa Cosmo range, a cotton carry-along yarn with large and small sequins. It is worked together with another yarn, such as wool or mohair, to add highlights to sweaters, shawls, edgings and fashion accessories. The 100 g ball gives about 260 m; needle size and tension depend on the yarn you hold it with.
The range has 38 shades: 36 is light grey with matt sequins, while 37 (light grey) and 38 (cream) have multicoloured sequins. To choose, compare 37 with the base yarn you plan to use; the closest shades are shown below.