2" × 18" JD Front grooved Polyurethane cast over heavy duty steel tubing Polyurethane body material is extremely abrasion resistant. Less uneven wear, cracking, denting, and overall longer life versus any steel rollers on the market. Unique grooved rollers that have gradual grooved crests and corners, not straight parallel grooves. Prevents hard debris from lodging in grooves and is kinder to your turf and diminishes transmigration of harmful elements such as disease or fungus. Sealed ball bearings that last without the need for re-greasing. Don't see your machine or roller style listed? Call us about the possible roller options to enhance after-cut appearance.