This is a worsted weight, machine washable, 75% merino wool and 25% polyamide (nylon) yarn designed for making socks - although don't let that limit your imagination!
These 150 gram balls have 344 yards (315 meters). The label states a gauge of 5 sts.= 1" on a US 6-8. However, if you are knitting socks, we would be inclined to use a size US 6 (4mm) with this yarn. One ball will make a pair of adult socks.