Flexible Pregnancy Belly Button Ring. Body Jewelry made with a pregnant woman in mind. Keep your piercing intact with this flexible pregnancy PTFE belly ring. The adjustable length pregnancy barbell will allow you adjust the piercing to your size. Specifications: Flexible Self Threading 14 Gauge (1.6mm) PTFE Shaft, 2" Length, Mirrored Lucite Acrylic Charm, 316L Stainless Steel Balls