The price of inline roller shoes is primarily driven by the frame material, bearing grade, and wheel quality. Entry-level models typically use plastic or composite frames, which are cost-effective but less stable. Professional or high-end models feature CNC-machined aluminum alloy frames for superior power transfer. For bearings, look for the ABEC rating (ABEC-5, 7, or 9); higher numbers indicate higher precision and lower friction. Additionally, high-rebound polyurethane (PU) wheels are essential for durability compared to cheaper PVC alternatives.