Larger imprint area on center cap. Bearings & weights are molded into plastic, so they won't easily come out. CPSIA Compliant. MADE IN THE USA!. Mix and match cap colors for unique color combinations. Outer weights appear to spin around center cap. EDC (Everyday Carry) product. Stress relief that fits in your pocket. Excellent for children and adults who need to keep their hands distracted. Long 2 minute spin time. ABS plastic body & carbon steel bearings