The ‘120’ indicates that these 0.16 Ohm coils have a ‘Maxi-Watt’ power capability of 120 Watts. Compatible with Aspire Cleito 120 Tank only and not any other Cleito tank. With careful design, and extra thick layers of organic cotton wicking material, replaceable Cleito 120 coils achieve their full, high-power potential without relying on multiple cores.