OBS Alter Kit comes with Subohm & Nic salt base for both high/low package, it is compatible with M1 M3 NX SX coils at the same time. 2ml/3.5ml/5ml cartridge means you can choose by different demandsas lon as you like. 2.5D toughened glass makes it durable and delicate. 2300mah mod can bring you durable and stable vaping experience with 70W max output. Adjustable airflow system for Nic salt base and top filling design are available.