18/19mm nylon tapered stem with stainless tip and replaceable stainless steel basket screen. Use this NonG (Nylon on Glass) to connect your dog to a tapered joint on your favorite glass piece. These are the same NonGs that work with Alpha-Dogs. This oversized stem fits over the center tube of your standard core vape, and uses the large size formed basket screens. See second picture for comparison to standard 18mm NonG.