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 1/2 inch (12mm).
The 6015 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.plastic.
The product is guaranteed for 5 years.
Good strong product, turned out to be slightly too large for my chair leg tube but was able to pack it out with some rubber. Now works well, large felt area seems good. Customer service was good, initially because my order was small the carriage cost was unfeasibly high, but Marilyn was able to offer an alternative carriage option.