These All Terrain Walkeroos are designed for individuals who use walkers to get around. The Walkaroos are supportive tips for walkers. They glide and move smoothly across carpet and floors while offering stability. Easy to install: remove old cap, put Walkaroo on and twist in place to secure. Comes in sets of 2. Designed not to catch on or mark flooring. Made of high density polyethylene. Non-porous material decreases chance of spreading harmful germs. Comes in a set of 2. DIMENSIONS: 1 3/8 inches height x 2 ¼ inches diameter with as 1 1/8 inch diameter opening. COLOR: They come in soft pink, purple, blue, red, and a teal green.