Description of Quartz Thermal Banger: - Banger Material: Real Quartz - Features: Double Tube Thermal - Banger Thickness: 2mm - Banger Outer Diameter: 28mm - Banger Inner Diameter: 17mm - Joint: Female/ Male - Joint Size: 10mm/ 14mm/ 18mm size:14mm male/female(10mm/19mm male/female are also available.please contact us if you need.thank you).syi