Dear Customer,If You Are Not 100 Percent Completely Satisfied With Our Products, Please Do Not Hesitate To Contact Us,Our Factory Will Be Glad To Serve You And Give You A Refund Or Exchange! Features: Replacement Of Parts#18128 Brand New And High Quality 100 Percent . Specification: Compatible With Brand Name Redcat Racing, Item Number: RER09587, RER09588, RER09585,RER09586, Model: Redcat Everest 10 Redcat Everest Gen7 Pro Redcat Everest Gen7 Sport 87T Gear Material : #45 Hardened Steel ,Very Durable For Use, CNC Machined For Precision. Increased Strength And Precision.Easy Upgrade From The Original Redcat Gen7 Parts Redcat Everest 10 Parts Package Include: 1Pc #45 Steel 87T Spur Gear ,Ready To Install