Yow Meraki Surfskate System S4 -50kg. The S4 Meraki System features a 4mm spring inside. It is recommended for children, adults under 50 kg, or very experienced surf skaters looking for aggressive rides. The YOW Meraki Surfskate System is the result of five years of research and development. A simplified and reinforced design, along with our patented spring system, makes it one of the most unique surfskate setups in the world. We have removed the consumable parts of our old system to keep our patented spring system intact and reinforced the essential components to make it lighter and more durable while enhancing its aesthetics. The new system is now unified with our own skate trucks, making it more stable without compromising the surf flow for which our system is known. Take your surfskating to the next level.