When evaluating Rattan Core, you must prioritize flexibility, color uniformity, and surface smoothness. High-quality rattan should be pliable enough to bend without snapping, indicating proper moisture content (ideally 10-15%). Ensure the core is free from black spots, burrs, or insect holes, as these defects compromise the structural integrity of the finished woven product. For premium applications, specify 'Grade A' Indonesian rattan, which is renowned for its superior fiber density and long-term durability.