Suitable for cotton,wool,linen,silk,fibre blending and pure spinning. The series upper roller bearings use double-line ball bearings,are suitable for drawing mechanisms with high rotational speed and heavy pressure and with many aduantages,such as,fine sealing function,durability,easy maintenance,flexible rotation oftwr giving pressure,smoogh rotation with small friction,less power consumption,etc. The product is esamined by Quality Supervising and Examining Centre for Textile Machinery of the National Textile Society.