The Smok TF Tank Bulb Glass Protective Sleeve is designed for bubble-style glass tanks, providing a protective barrier against drops and breakage. Made from silicone, it fits over thicker and taller bubble tanks. Side holes allow monitoring of e-liquid levels without removing the sleeve. This sleeve is compatible with Smok TFV8 V2 Baby Tank, Smok TF Tank, and Smok TF-D Tank. Not compatible with straight glass tanks.