Acrylic spike and ball titanium curved barbell, 12 ga
  Gauge (Thickness): 12 (2.0mm)  Ball size: 3/16" (5mm)  Spike size: 5/32" (4mm)  Material: acrylic  Material: surgical grade solid titanium  Type: curved barbell  -: 9/16" (14mm) spike length   Shown: 11mm curved barbell.