Cap Style: Roller ball and black over cap Color: Amber Capacity: 1/3 Ounce (10 ml) Size: 20 mm x 70 mm (.79 x 2.76 in.) PRICE INCLUDES ROLLER BALLS AND CAPS. These small amber glass bottle are a handy way to apply essential oils, blends, and massage oils to the skin—simply roll them on as needed! Make sure after putting the oil is in the bottle, place the roller top in the hole. Using two fingers, pinch the roller top and press firmly into opening until fully inserted (try not to press on the roller ball itself). Be careful and hold tightly to the bottle during this process.