bottle cap
circular top that fits onto a bottle metal or plastic material usually has a logo or brand name knurled edge on the outside of the cap ridges on the inside of the cap hole in the center of the cap tab or button on the top of the cap
bottle cap which has circular top that fits onto a bottle bottle cap which has metal or plastic material bottle cap which has usually has a logo or brand name bottle cap which has knurled edge on the outside of the cap bottle cap which has ridges on the inside of the cap bottle cap which has hole in the center of the cap bottle cap which has tab or button on the top of the cap