Nitro's pro level racing bearings - X-7 Ceramic - feature removable delrin seals.  Manufactured by Khiro Skateboard Products for Pro Team Rider - Jason "Racer X" Mitchell - multi-time downhill slalom Pro World Champion - in the mid-2000's.  The Nitro X-7's are very high-quality premium bearings and come packaged in a hard plastic screw-top tube.  

Set of 8 bearings - enough for four wheels - one skateboard

About Khiro: Khiro Skateboard Products officially closed in 2017 and their substantial remaining line inventory was acquired by Sk8Kings Skateboards for further sale and wholesale handling.  The line is no longer in production so availability is limited to remaining stock. Khiro Skateboard Products was originally owned and operated by Bob and Lou Ann Hinrichs and was based in San Marcos, CA.  All products were engineered and manufactured in Southern California of the highest quality materials. Their impressive and innovative line featured bushings, risers, wedges, hardware and more to cater to all types of skateboarding, such as street, banks, bowls, rails, gaps, transition, big vert, pipes, slalom and downhill. Sadly, "Khiro Bob" passed away in 2024 after a long and well-fought battle with cancer.  The legacy of the Khiro name fondly lives on in the skateboard community ... we will forever appreciate the contributions and caring attention to customers offered by the Hinrichs.