Ryan Decenzo Signature Pro Series Isotope Bearing Kit. Enter the isotope ceramic hybrid series. A bearing designed for the high-impact street/park skater looking for the speed and performance of a ceramic bearing with the mechanical durability of an all-metal design. It's a highly versatile bearing that delivers unmatched performance from street sessions to backyard ramp jams. As with Metallics and atoms, we start with high purity and high quality carbon steel for inner/outer rings, doped ZrO2 ceramic roller balls for friction/thermal/shock resistance /impact, and high tensile strength engineered retainers - these bearings are a great balance of flow and mechanical strength and serve as an excellent option for street and park skaters alike. Each bearing is coated with our GraphFlo process and "burned in" at high speeds. All of our bearings are 100% tested before being packaged or shipped to ensure consistency and performance right out of the box. 8 x Ceramic Hybrid Isotope Series Bearings with GraphFlo Ceramic Technology.