The Silicoil Brush Cleaning Tank is a glass container. Directions: Stroke brush bristles across the coils to open and separate the bristles for better cleaning without damaging the fragile bristle tips. Dimensions: 3 5/8" Diameter and 3 7/8" Tall. Caution: Container is made of glass and may shatter when dropped. Made in the USA. This container has a screwed on lid that is leak proof. The glass is easy to clean!