Scope Application: Replacement rollers fit for total gym models: 2000,3000, some 3000xl, and some very early XL, standard size. Bearing does not stick out of the wheel. NOTE that if the wheel of your gym has a protruding bearing on one side, these are not suitable. Rollers Kit Size: Bearings included with the thru hole of approximately 1/4"(M6), The outer diameter and the inner diameter of the wheel (white part) are 1.25" and 0.75". Upgraded Design: The overall design with rounded wheels can better withstand the pressure and is not easy to be damaged. Our rounded wheel design is more durable than the original roller. Quality Material: Replacement wheels/rollers are made of high quality engineering plastic, The bearings are made of high pressure forged steel, the whole is more smooth. Quieter when working. Give you a better application experience. Customer Service: If you have any questions or encounter any problems while using this 4pcs replacement wheels/rollers, please contact us proactively. We will reply promptly during working hours and do our best to solve your problem. Scope Application: Replacement rollers fit for total gym models: 2000,3000, some 3000xl, and some very early XL, standard size. Bearing does not stick out of the wheel. NOTE that if the wheel of your gym has a protruding bearing on one side, these are not suitable. Rollers Kit Size: Bearings included with the thru hole of approximately 1/4"(M6), The outer diameter and the inner diameter of the wheel (white part) are 1.25" and 0.75". Package Included: 4x Replacement Wheels/Rollers