Cortex Slam Cap NTSU by Ghost Bus Club Optimize your vaping experience with the CRTX (Cortex) Slam Cap. These are replacement RBA caps for your NTSU/NTSU PLUS+ RBA.  RBA is not included. Cap only. CRTX Slam Cap An essential accessory for the Ghost Bus Club NTSU bridge. This exclusive kit includes a reduced chamber for an explosion of flavors and a long chimney for velvety vapor. In addition, the CRTX offers you the possibility of increasing your e-liquid capacity, going from 4.8 ml to 6 ml in a NTSU boro. Experience more intense vapor and increased capacity with the CRTX Slam Cap, redefining your vaping experience. MADE IN ITALY