These polyurethane dumbbells are constructed from alloy steel pressed onto solid steel, with a complete outer welding. Their compact structure ensures maximum strength, minimizes damage, and reduces the need for maintenance. The dumbbell heads are up to 8mm thick and feature a polyurethane layer that provides exceptional shock absorption and buffering capability. This design effectively safeguards the floor and surrounding equipment. The handles are equipped with medium-intensity diamond knurling, enhancing grip and overall comfort during workouts. Additionally, the handle surfaces are plated with hard chrome, preventing rust and extending the dumbbells lifespan. With a strong performance history and a reasonable price point, these dumbbells are ideal for targeting various muscle groups during your exercise routine.SPECIFICATIONS Color black / silver / blue Material solid steel head, polyurethane layer package Weight range 2-50kg handle length 152mm Handle diameter 2-20kg, 32mm diameter 22-50kg, 34mm in diameter