Shark Wheel 70mm or 60mm Longboard/Cruiser Wheels (78a) with Free Shiver ABEC 9 Bearings Shiver Abec 9 bearings with built-in spacers and speed rings Shark Wheel longboard/cruiser wheels 78a durometer Lasts 15% longer than industry leading wheels (scientifically proven) Great slide control, Best wheels in the world over rough terrain Less friction - very fast with little effort <span class="a-text-bold">Free Shiver Abec 9 bearings</span> with built-in spacers and speed rings. High performance, precision engineered. <span class="a-text-bold">All Terrain</span>: Shark Wheels #1 advantage. The ability to go over rough terrain, pebbles, water, sand, debris, etc. Shark Wheels tend to go <span class="a-text-italic">around </span>most objects, while traditional wheels tend to go <span class="a-text-italic">over </span>objects leading to rock stop. <span class="a-text-bold">Less Friction: </span>30% smaller contact patch equates to higher speeds and less effort to get up to speed. <span class="a-text-bold">Lasts 15% longer</span> than industry leading wheels (scientifically proven). Shark Wheels have multiple center points, while traditional wheels have one center point. It takes longer for Shark Wheels to wear off-center. <span class="a-text-bold">Great slide control: </span>Shark Wheels have a small contact patch making it easy to break into a slide. Also, Shark Wheels have 3 lips grabbing on a slide that results in a controlled, predictable slide. Traditional wheels have only 1 lip. The sine wave shape gives you maximum lateral grip, while still providing low friction - something no other wheel can claim. <span class="a-text-bold">Flatspot/Coning Resistant: </span>Shark Wheels continue spinning as they slide. Traditional wheels tend to skid and chatter when you slide them. A wheel that is always spinning leads to less flatspotting/coning. <span class="a-text-bold">Manufacturing: </span>Made in California, USA <span class="a-text-bold">Fun: </span>Shark Wheel are super fun to ride and feel perfectly smooth through all terrains. You will receive a lot of comments riding Shark Wheels - they seem impossible they would even roll.