Those OCC heads are custom designed for UD Youde Goliath V2 Rebuildable Tank Atomizer.
The wires are made from Kanthal A1 with 2 different resistance: 0.2ohm & 0.5ohm.
1. Provides incredible flavor and vapor using the 100% Organic Cotton made in Japan
2. Uses a dual coil and ceramic base to produce the best flavor
3. The ceramic base allows it to be cool even when chain vaping