My grandfather built the house, and the subfloor was substantial and the oak flooring was very thick. It left tracks across the entire room when it was rolled out the door onto the front porch. Thankfully, we were able to sand the indentations of the rollers completely out, and refinish. Did not have to use any filler where the wheels sat for so long. I recently installed hardwood flooring in my upstairs loft, bedroom, etc., and I put the teflon sliders under everything. Lowes has them in packages of differing sizes and shapes. They work great, and spread the load of dressers, bed stead, tables, computer desk, etc. Flooring is not cheap, and I will gladly use those teflon sliders to save the finish and not mar that asset. Joe-JDC