RDEXP Black Square Dusting Brush Horse Hair Fit 1.25" Vacuum Cleaner Attachment Replacement Tool Made of ABS plastic ,horse hair the brush is soft and can prevent the floor from scratches the inner diameter is a standard 32mm/1.25inch size,allowing the attachment to be used with most household vacuum it can be used for cleaning the electronic such as computer ,keyboard ,even musical instrument it works with most vacuums to help clean your house floor