Seismic 7-Ball Ceramic Pro Spec Built-In Bearings

We spent over two years nerding out with a crack team of American engineers from one of the biggest and best bearing factories in the world, to raise the bar on bearing tech yet again! Roll tighter, truer, faster, and smarter on Fullspin: the most precisely-engineered skate bearings ever seen! THE BASICS (Scroll down for more in-depth technical info.) 7-Ball system Best overall balance of speed and resistance to frequent impacts and side loads. Recommended for high-speed turning / sliding and all style / trick disciplines. Ultra-Premium Ceramic balls Manufactured to superior Grade G10 standard and with next-level Pro Spec dimensional precision for truer, lower-friction ball spin inside bearings. Ceramic balls are lighter, smoother, harder, lower in friction, self-lubricating, more heat-resistant, completely rustproof. Increased acceleration, speed, and durability versus Steel balls. Exceptionally tight, consistent assembly and raceway tolerances Significantly less internal play, friction, wear, and noise. Superior speed, handling, and durability. Pro Spec steel and thicker outer rings Super-hard carbonitrided raceways hold precise curvature and exquisitely-smooth surface finish like nothing else! Bearings stay tight and fast noticeably longer than any other tech ever seen. Thicker, 60%-stiffer outer rings resist flexing, spin truer and faster, and keep seals from popping off on extreme impacts. Premium black oxide surface treatment adds exceptional corrosion resistance. Next-level patented Built-In spacing / alignment system Built-in half-spacers with extra-wide flanged ends* square up inside wheels with more than double the contact area of ordinary Built-In interfaces powering absolutely unparalleled alignment precision and stability. System levels and steadies all working components of seated bearings far better than any other design (Built-In or Classic), to unleash near-perfectly optimized paired performance. Synergizes with all advanced features in individual bearings to maintain exceptionally consistent wheel contact and grip; support extremely predictable slide performance; and noticeably extend both wheel and bearing life. Pro Spec lubricant Premium formula and volume calibrated for peak performance in racing conditions (not max free-spin time). Labyrinth-style outer seals Edges of seals slot inside V-shaped grooves for maximum resistance to dust and debris. Next-level anti-contaminant ball retainers Made with tougher, lower-friction Pro Spec material. Expanded outer diameter slots into groove in outer ring just like a second seal, to form a unique integral barrier against dirt and grime. * Note: Flanged half-spacer ends may not fit into hub-less street wheels with extra-thick urethane bearing supports. Choose Fullspin Classic or Fullspin LITE Built-In bearings for wheels of this kind. Compared to Steel balls, Black Ceramic balls are lighter, smoother, harder, lower in friction, self-lubricating, more heat-resistant, and completely rustproof. These properties combine to increase acceleration and speed… while also continuously scouring and cleaning the raceways for extended bearing life. Markedly superior to the White Ceramic balls used in budget Ceramic bearings formed of Alumina Oxide (Al2O3), those have a higher friction coefficient and don't dissipate heat as well. Manufactured to Grade G10 standard and with superior Pro Spec dimensional precision for truer, lower-friction ball spin inside bearings; less energy loss; more speed; and longer bearing life. Compared to balls used in run-of-the-mill skate bearings, G10 specs are 60% 80% tighter for concentricity (roundness), and 50% 67% stricter for surface smoothness. (In simpler terms, twice as smooth as the finest cue ball, 10 times as smooth as a mirror finish.)