Tungsten cone... sinks great. No problems getting it on the hook or running braid through it.
Tied up a bunch dolly llamas... started with an open pack of Hareline's and switched to the Wapsi pack when I ran out. Noticed some of the Wapsi's had nicks and imperfections on the bottom edge of the cone when caught my thread and dubbing loop on them. The Harelines didn't - I checked.