Here is an ab wheel that lets you do more. The 3S Ab Wheel has a handle and wheels that are rotatable 90 degrees. You can use this on cement, wooden, and carpet floors. It can withstand up to 100kg of weight. These ab wheels are compact enough to easily fit in your gym bag.
The 3S Ab Wheel has an ergonomic design with anti-skid wheels and brake pad. They are available in 2 colors. You can find out more about them here.