Future Cluster (Barbell not included) 1 x 4 mm Center Stone 2 x 2.5 mm Clear Stones Internally Threaded for 18G/16G 14Kt Yellow Gold Non-Sterile Thread not in Gold Vendor: Body Gems Fits Body Gems barbells in 18G/16G and fits internally threaded barbells in 18G/16G from all APP approved jewellery vendors (USA)