If you have metal sled base chairs that are ruining your floors then you should look at this Flexi-Felt model designed specifically to fit tubing of 3/8 inch (10mm). The 6010 Flexi-Felt model is made of transparent and very durable plastic.
Once the unit is installed properly it is very difficult, almost impossible, to remove.
Our sled base models offer unsurpassed floor protection with the largest surface contact area on the market.
Our patent pending antiroll system is guaranteed to keep the Flexi-Felt® well aligned. .
The product is guaranteed for 5 years
Thought it was expensive but the product function way better than anticipated, worth the money against damage to the floor