These are Aspire replacement coils which work with the Cleito Tank. These have an exclusive design which gives better flavor and vapor. The design also means that they last a long time and that they have better airflow. The new coil also means that the Cleito is able to work at higher power and wattage settings than other, earlier models. These will only work with this specific model of tank. It is worth getting some of these if you have the Cleito tank and keeping them in stock. This is because coils need to be changed regularly. The new coil will produce a better flavor and vapor than an old one and so you will notice the difference. It is usually recommended that you change the coils every 2-4 weeks, depending on how often you use them, therefore you will need them fairly often and it is wise to have a selection of spares handy.