Features: Heavy Duty Load Capacity: The black rubber trailer bottom wheel is designed for heavy duty boat trailers, supporting up to 1000kg load capacity. It solves the deformation issues of traditional pulleys and is ideal for transporting 6 person boats over long distances. Wear Resistant & Quiet Operations: The blue PU trailer top wheel features high elasticity polyurethane , reducing rolling noise by 50% compared to PVC wheels. It protects boat surfaces from scratches, perfect for frequent loading/unloading. Anti Derailment Design: The large yellow PVC trailer top wheel has a 15% wider diameter to prevent boat slippage. With 1.2cm thicken wall, it resists derailment on bumpy roads, making it suitable for off road trailer scenarios. Enhanced Wet Grip: The blue EVA grooved roller features deeply treads patterns for 30% better traction on wet or sloped surfaces. Ideal for transporting expeditions boats in rainforest regions. Quick Release Compatibility: The blue PU top wheel set includes a pumps interfaces and paddle slot, enabling easy assembly in 3 minutes. Specifications: Component:Rubber,PU (optional) Maximums load capacity 1000kg Package Includes: 1Piece Trailer Roller note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.