Product Overview: Set of Four (4) machined wheels/rolers compatible with Total Gym replacement, never used Fit Models: compatible with Total Gym XL, XLS, and Fit models have bearings thru hole of 1/4 "diameter. All bearings contain Product Function: Made from high-quality solid engineering plastic material, ensures gym operates at peak efficiency Upgrade Quality: Wheels designed with smoother, quieter material. Lab and gym tested, stronger and lasts longer than originals Guarantee: Manufactured to function as well as original OEM parts, offering better value than comparable original equipment parts Vsttar Qty.4 Machined Wheels/Rollers Compatible with Total Gym Replacement, Fits Models XL, XLS, & Fit with Bearings Thru Hole of 1/4'' in Diameter, Black