C&F Design Standard Saltwater Bobbin Holder. 

･ Micro Flit Foam in the tube constantly puts tension to the thread, and prevents the tube clogging.
･ Non-slip knurling and cylinder lines on the body.
･ Optimized weight (29g) keeps tension on the material by just hanging.
･ Original bobbin tube, made of Zirconium ceramic, reduces the risk of thread breakage.