Innokin Endura T18E is Compatible with the following Innokin devices In 1.7ohm resistance for the Innokin T18-E Prism tank and Innokin T18-E Starter Kit, T22 Pro Vape Kit or T18 Pro Tank. ThThis 1.7Ohm Innokin Endura T18E coils are designed to be used MTL (mouth to lung).