? UNIQUELY DESIGNED: Our AB wheel roller has 4 wheels, and offers better balance and support when rolling than normal rollers, with durable construction and quality materials. ULTIMATE ABDOMINAL AND CORE TRAINER - Adults, Men, Women, Children, Kids, Boys, and Girls can burn unwanted belly fat with our uniquely designed ab roller. The Ab Roller builds muscle density and sculpts abdominals, obliques, shoulders, arms, back & core. The perfect total workout for all fitness levels, from beginner to advanced, at home or gym. Portable and popular - makes a great gift! NON-SKID WHEELS: The textured wheels are skid resistant and grippe, promoting stability and control; the solid core is molded and very firm; each wheel fitted with 2 bearings for smooth rolling HIGH-QUALITY ACCESSORY: Each screw has an anti-skid rubber ring, securely fitted to the screw and offers security VERSATILE - Not just for floor exercises, this unique fitness equipment can also be used against walls. Great for stretches and extending mobility