tuning pin造句

• Our key products including tuning pins , hinges , damper rods , casters , pedals and pressure bars while we also produce kinds of adjustable piano benches , white / black keys and logos
  专业生产全套钢琴五金配件，主要产品有：弦轴、铰链、抬档、脚轮、踏板、压线条等，还生产不同规格的琴凳（升降） 、黑白琴键和商标。