1. 10 Pack Y Vacuum Bags -- 10 Packs 16.5x42cm(6.5x16.5 inch) hoover vacuum bags type y. The inner diameter is about 5.5cm (2.16inch). Make sure the size is suitable before buying.2. Great Fit -- The hoover type y vacuum bags compatible with Hoover Wind Tunnel Uprights vacuum cleaners that use Style Y, Z, YZ bags; 4010100 vacuum series. Replace part #4010100Y.3. Powerful Suction -- hoover y vacuum bags have high-efficiency filtration to capture most dust, hair and other small particles. Help you get rid of dust-related discomforts. Create a y and air-fresh living space to breathe easier.4. Easy to Replace -- No other tools needed. Easy to remove the old one and install the type y vacuum bags. To maintain optimum performance. Recommend to replace your vacuuming bag when 2/3 full or when vacuuming fine particles.