The material the bristles are made of on the brush of the DeWalt Vacuum accessory attachment DWV2759, is polypropylene.

DCV517M1                                            DWV2759
20V MAX* 1/2 Gallon                             5 Piece Dust Extractor 
Wet/Dry Portable Vac Kit                        Accessory Kit

Polypropylene is a type of plastic that is flexible, tough, and resistant to fatigue and chemicals.

Remember some benefits of this material: 

• Highly resistant to corrosion
• High strength and durability
• Great electrical insulator
• Its use is considered safe