Bulb Duster 4 oz is made of a long lasting rugged construction, heavy duty rubber. May be used to apply dusts behind electrical outlets and light switches. Ideal for homeowner use. This duster will hold up to 4 oz. of dry product. It's economical and useful to apply pesticide dusts. Works well with fine dusts such as Delta Dust, Evergreen Dust, Timbor, Borid Acid Dust and Eco Exempt or Pco D-X Dusts.