- SXK Boropad Standard DL Style Airflow Plug + Air Inserts is suitable for Billet Box Mod Kit / SXK BB Box Mod Kit. Targeted for loose MTL, restricted DL and DL vaping, comes with 4 PCS air inserts: 2.0mm / 2.5mm / 3.0mm / 3.5mm.

 --SXK Boropad MTL Style Airflow Plug + Air Inserts is suitable for Billet Box Mod Kit / SXK BB Box Mod Kit. Comes with 4 PCS air inserts: 1.0mm / 1.2mm / 1.5mm / 1.8mm.