The Picasso Tungsten Neko Weight offers an innovative screw-locking system that firmly secures your soft plastics and reduces loosening on the cast. The exposed head is constructed from high-density 97% tungsten that provides optimal feedback of bottom structure and detection of the most subtle of bites. Available in two spring diameters to fit a wide range of plastics. Small Spring- Recommended for thinner diameter finesse worms. Medium Spring- Recommended for thicker diameter worms.