Here is a set that lets you combine cardio and strength training to push your body harder. The TKO 40lb Cardio Pump Set has a 55-inch steel bar covered with foam grip. It also comes with a bunch of PVC-coated plates (2 x 10lb, 2 x 5lb, and 2 x 2.5lb). It comes with a pair of spring collars.
You can use these weights without having to worry about damaging your floor.