If you have furniture legs that are 1/2" thick by approximately 1-1/2" wide, then this model is for you. The D6050 Flexi-Felt model is made of transparent and very durable plastic with a dark wool blend felt bottom. The D6050 model is made in North America with our dark color wool blend felt. It’s an environmentally friendly alternative to tennis balls and other synthetic products. Once the unit is installed properly it’s very difficult, almost impossible, for children to remove it. This is the only model made for those difficult to fit, very narrow furniture legs that nothing else will hold onto to protect your floors.