Capacity: 50 ml/1.69 oz; Material: Made from thick glass; This roller bottle set includes 4 pack roller bottles bottle with plastic roller ball and 2 pcs blue opener Widely Usage: These roller bottles are versatile and can be used for a variety of liquids such as perfumes, cosmetics, essential oils, and DIY to meet different needs Bottle size: bottles with black lids have a tight seal and are not easy to leak. The size of the bottle is about 37 x 116 mm/1.46 x 4.55 in, making it ideal for carrying around and putting in your bag without worrying about spillage Rollerball design: These refillable roller ball bottles provide a smooth rolling action for easy application of oils and perfumes. The deodorant containers is easy to use and perfect for your daily or travel use Easy to Refill: The empty perfume bottle containers are easy to clean and refill, Wide opening for easy storage of essential oils, perfumes. Enjoy the convenience of a refillable roller ball applicator