It is constituted of steel main body, electronic launcher, polyvinyl fluoride resin (rubber) bushing with different hardness and shapes in the light of specific coat characteristics.

• 它是由金属钢制主体、电子发射机、聚氨酯（橡胶）皮碗、根据涂料的不同性质采用不同的皮碗硬度、形状组成。