As an essential oil , when you add the essential oil to the wick of these empty , and seal the tube with the lids, the oils last a very long time. Which allows you to receive the oils' natural soothing properties for much longer periods of time without having to re-soak the wicks. When your scent finally does fade, the caps are removable and the wicks can be re-soaked for of long use. Features - Color: White. - Material: Plastic. - Size: 10.80X9.00X4.80cm/4.24X3.54X1.89inch. - These essential oil refillable tubes are constructed of sanitary white plastic. - With small size, the are suitable for carrying when you need to go out, very applicable in your daily life. - Each set of composed of several parts, they can be tightly sealed, thus can lengthen the lasting time of scent, smell, aroma and so on. - The sticks are refillable, you can screw off the and add some essential oil to the wick when it needs to be refilled. - Cotton wicks can be put into the tubes well, made of cotton, can absorb essential oil and other liquid well. Package list: 5 x Tubes