Package includes: 2 x 7cm governor springs, 2 x 4.5cm governor springs, 4 x lawnmower air filters. Material: High-quality sponge, low resistance, high suction efficiency, low suction noise, sufficient fuel atomization, increased engine power and oil saving. Air filter use instructions: It is recommended to incorporate a little oil into the sponge before use, as this makes the filter more effective at trapping dust particles, apparently. Note: Please check the model number and size before ordering to ensure the correct part. Wide applications: Compatible with Briggs & Stratton 4216 5086K 5088 5088H 5099 698369 10a900 98900 9b900 MTD 490-200-0011 Craftsman.