Compatible with Shark Detect Pro Auto-Empty System Vacuums IW3511, IW1120 and IW1111 Compatible with Shark Clean Empty Auto-Empty System Portable Handheld BU3523, BU3521, BU3120 Package includes 6 Pack HEPA Filter for BU3523, BU3521, BU3120, IW3511, IW1120 and IW1111 High Quality Material: Our HEPA filters are of high quality and more durable. Made of high-strength and environmental protection material Colour:As Shown Material:plastic Package Contents: 6 * Filter 1 * Cleaning Brush Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.