La-VIE Smooth Abdominal Roller with Built-in Bearings, Ultra-Quiet, 2-Wheel, 3B-4010 An abdominal roller with smooth rotation thanks to built-in bearings. - Product Name: Smooth Abdominal Roller with Bearings - Color: Black - Materials: Plastic, Rubber - Features: Built-in bearings, smooth rotation - How to Use: Abdominal training, core strengthening Thank you for viewing.