General description Replacement Parts HEPA Filter compatible with Dyson DC28C, DC33C, DC37, DC39C, and DC53 vacuum cleaners. These filters are brand new, made of high-strength and environmentally friendly materials, and are easy to install. It is recommended to replace the filters every 1-2 months for optimal performance. Technical specifications Material: Plastic Package Contents: 5 x Filter Elements, 2 x Cleaning Brush Measurement allowed error: +/- 1-3 cm