This 2 piece screw & marble terp bead set from Pulsar includes a large marble carb cap and a screw style flow bead that is perfect for use with the Terp Slurp Banger. Terp marbles assist by stirring concentrates via airflow and regulating airflow as a marble cap. Multiple colour options available. Marble set approximate sizes are 23.75mm marble diameter & 26mm x 14mm screw dimensions. Please Note that the terp slurper bangers are sold separately and are shown for illustration purposes only. **Caution:** Only apply heat to the bottom dish of your terp slurper banger. Heating the bucket where the centre bead is located can cause thermal shock and crack it. Terp Screw & Marble Set Features: Use: Concentrates Size: 22mm | 12mm | 6mmx16mm Colourful Spiral Designs Borosilicate Glass Material Perfect for Terp Slurp Bangers (Not Included) Assorted Colours