The size of the brush is 7. 7*7*1. 2cm. One end of this brush is nylon bristles, used to clean the keyboard, as well as the key crevices are not easy to remove the garbage; the other end is the screen wipe, can be used to clean a variety of fluorescent screen; this brush has a protective cover at both ends, when not used to protect the brush, beautiful and practical, inexpensive and good value.