Stem bumpers are typically used on the bottom of swivel base outdoor patio chairs. They come in two unique styles and will fit most style of outdoor patio swivel chairs. The bumpers are essential chair glides or chair feet that keep the metal chair frame lifted off the patio or deck surface. The stem bumpers protet both your patio chair frame as well as the surface of your outdoor space. Curved or "Coved" stem bumpers work on swivel chair frames that are round or tubular and conform to the shape of the frame. Flat Stem bumpers work on a variety of chair bases. Find them in both black and white to match.