Foldable 4 wheels: the wheel roller has 4 wheels and offers better balance and support when rolling than normal rollers. It can also be removable, easy to store and carry to the gym or at home. It is compact, lightweight and portable. Premium quality: use a thick steel tube (1.5 mm wall thickness), which is safer to use at 200 kg. Each roller is equipped with two low-noise, wear-resistant bearings that allow for a smooth and silent rotation. Our knee pads are made from high quality yoga mat known as NBR. It provides stronger support yet softer touch. Stay comfortable while your core burns! Non-slip handles absorb sweat. The handles are covered with thick foam, can absorb sweat, and are non-slip; with the comfortable handles, the training time can be extended. Tighten your stomach: this practical and practical fitness device can help you tighten your stomach, lose abdominal fat, train your abdominal muscles, chest muscles, arm muscles and other core muscle groups. Anyone can use it, whether for beginners or advanced users who regularly do sports. Very good for all fitness levels. Can be used at any time, floor-friendly. With the abdominal muscle trainer, you can train at home, in the office or in the training room, and your floor will not be damaged. Please contact us if you have any questions about our abdominal trainers. We will do our best to ensure your satisfaction.