1.GREAT AB AND UPPER BODY TONING - Strengthens abdominals, shoulders, arms and back all at once, so you get an efficient all-in-one toning workout. Specification: Material: engineering plastic Applicable occasions: Body building, health care massage, running movement Size: 18 x 24 x 80cm/7.08 x 9.44 x 31.49in Package: specialized box Weight: 485g Scope of application: outdoor, home, gym, office 2.BETTER STABILITY - Dual wheels allow for greater stability than models with just one wheel, so you can focus more on safely strengthening your abs and less on trying to control the movement with your arms. 3.EASY GRIP – Two, easy-to-grip handles are designed with slots for your fingers for improved comfortability that won’t easily slip as you roll back and forth. 4.SIMPLE AND EFFECTIVE – This simple tool can be used at home, in the gym, or anywhere you want to squeeze in a workout. Despite the small size and low price, it is an incredibly effective abdominal strengthener, even for the most advanced users. 5.QUICK ASSEMBLY – Requires minimal assembly, and is fast and easy to put together, so you can get to exercising your core and abdominal muscles right away! The size is small and simple to store and carry, no disassembling required.