N&D Ab Roller Wheel Ab Machine for Core Workout - Abdominal Exercise Equipment - Ab Workout Equipment for Women & Men with Knee Pad Mat, Automatic Rebound and Multiple Angles Core Workouts

Built-in steel: built-in 3mm thick seamless steel, which can bear 400 kg. Tire pattern roller design: environmentally friendly PVC material, non-slip, dirt-resistant, wear-resistant and more durable. Humanized handle: personalized engineering design, designed for easy squeezing of the thumb, comfortable to the touch, and handle pattern design to prevent hands from sweating and slipping. High-quality plastic-intruding spring: high-quality carbon steel raw materials are used to make the spring more durable. The surface of the spring has undergone a plastic-invasion process, which is completely silent during use.