Extra Wide 5.5" Wheel- For the superior stability, our size is several times than others. Not flimsy at all when workout, it is weighty but not too heavy. One wide wheel make you get balance easier than other small ones, and will not wobble when using. Also it doesn't need to assemble! Just take it out of box and start exercise in home, office, gym, or anywhere Taiwan-made Sturdy Material- It is made in Taiwan instead of China (majority products are). It is made of strong stainless steel, non-slip TPR Rubber & durable PP, can load over 300lbs, ensure safety, comfort and silence. You can experience its solid and stability in intense workout. This superior wheel may be your best cost-effective choice