The roving is a bundle of parallel or parallel monofilaments. The roving of the roving can be divided into: alkali-free glass roving and medium-alkali glass roving. The glass fiber used to produce the glass roving has a diameter of 12 to 23 μm. The number of rovings is from 150 to 9600 (tex). The roving can be directly used in some composite material forming methods, such as winding and pultrusion processes. Because of its uniform tension, it can also be woven into a roving fabric. In some applications, the roving is further chopped. .