1, blade design is different: black roller skates have high curvature, which helps to accelerate and maintain a stable sliding state, and are suitable for speed skating, while blue roller skates have low curvature, which is suitable for technical skating, turning, jumping and rotating.
2. Different materials: Black tube skates are made of high carbon steel, which has better elasticity and durability and can withstand higher speed and impact, while blue tube skates are made of stainless steel, which has stronger corrosion resistance and relatively poor elasticity and durability.