Barrel: As an extruded piple of heat-treated aluminium,it has high strength and precision has excellent rigidity and durability. 

Welding: Welding with high precision using a MIG automatic welding method by ROBOT system Because of dynamic balancing function,a good compatibility with weaving machinery is maintained even through high-speed rotation. 

Through hard anodizing coating treatment,corrosion and surface scratching are entirely prevented  durability and precision are maintained even after several years utility.