PAPAISON XZY-301 Adjustable Inline Roller Skates Blade Scooter Skating for Kids Adults Type/Color:Blue Shoes Only A double planetary gear reducer

A double planetary gear reducer with differently shaped gears provides the necessary speed

A comfortable and spacious sidecar that has enough room to transport tiny passengers

and is able to travel over 2m on a single winding

STEM lab model kits come with all you need in a box

PAPAISON XZY-301 Adjustable Inline Roller Skates Blade Scooter Skating for Kids Adults Type/Color:Blue Shoes Only A double planetary gear reducerDescription Premium Quality!! You will have a totally different feel of amazing skating experience!! Brand: Papaison Model: XZY 301 4 Easy Adjustable Sizes by pressing the Sections Adjusting Button. Perfect for growing feet and even for adults! Suitable for Kids to Adults! Breathable air vent mesh Smooth and durable wheels ideal for indoor or outdoor use Available Size: S, M, L, XL (refer to our size chart) Available Colors: Blue, Silver, Red