[Good Sealing] - The dust bag is made of melt-blown fabric and non-woven fabric, combined with the cleaning station to effectively capture 99.7% of ultra-fine dust down to 0.3 microns. [Auto Lock] - Automatically locks when the dust bag is lifted, sealing the inlet to ensure dust and dirt remain contained. [Tips for Use] - To maintain optimal robot performance, clean and replace parts as needed. For households with allergies or pets, replace the dust bag every 2-3 weeks. Large Capacity - The dust bag offers ample space to collect more dust, reducing the frequency of replacements. Easy to Replace - Simple design allows for quick and tool-free installation; no special tools or skills required. Compatible Models: Nilfisk Buddy II 12 / 18 Quantity: 4PCS Color: White Material: Non-woven fabric Package Contents: 4 x Dust Bag