Metal ring gaskets conform to API 6A Annex B specifications including R, RX, and BX profiles. R-type oval gaskets suit moderate pressures. RX-type octagonal gaskets handle higher pressures through increased cross-sectional area. BX-type gaskets incorporate pressure-energization features for extreme pressure applications. Material options include soft iron, stainless steel, and nickel ... https://globalsealstech.com/product-category/oil-gas-seals/api-6a-wellhead-equipment-seals/