Premium Air Filter: Soft gasket, better seal. Larger filter area, 4% higher air intake than original, less rubber flash, breathe better and higher gas mileage. Model Air Filter: Compatible with Briggs & Stratton 491588s 491588 4915885 399959 push lawn mower, bs- 4101 5043 5043A 5043D 5043H 5043K. Fit 3.5- 6.5 HP quantum small engine, 625 675 725 625-675 e/ex series element. Wide Use Parts: For Toro 20332 20334 20330, Craftsman, Honda, Troy Built walk behind lawn mower / tractor air filter. Replace part number of OEM air cleaner. [Note: this item is not compatible with Kohler engines, please check] Durability Air Filter: 5 pack air filters, especially against heavy dust and grass without anxious. Exact size, fit like a glove. Individually sealed, easy store. Comfortable throughout the whole season. What You Get: 5 pack excellent air filters, our friendly and prompt customer service. Worthwhile to choose [ Filter Size: 5-1/4" Length 4-1/2" Width 13/16" Height ]