Material: Plastic Resin, Lightweight And Secure Inside Diameter of Rings: (1.49", 1.69", 1.89", and 2.04") Length of cage - 3.03", inside width of cage - 1.22" Includes: Rings(4), PA Adapter, Cage, Internal Lock and keys The included piercing adapter (PA) is optional to use, and comes uninstalled, the regular standard smooth adapter has been installed, and is ready for use.