The Crown 3 III replacement coils by Uwell are made specifically for the Uwell Crown 3 Sub Ohm Tank. The Crown 3 Tank coils use the new”Plug-Pull” technology. Featuring a larger coil design and large juice ports, improves the wicking process and allows the coils to last longer. The Uwell Crown 3 coils use SUS316 Surgical Stainless Steel wire wrapped around 100% Organic Cotton giving you the richest flavor possible.