Official Goopy Performance Oversized Apex Seals Sets of 6 (with corner seals) Oversized thickness apex seals are designed to improve sealing for out-of-spec rotors with apex seal slots that would normally be too wide. All Goopy Apex Seals are designed with strength and longevity in mind. Made from "Goopy-Alloy" in the USA, these seals will support all your needs from stock engine overhauls to high horsepower builds. Size Guide 2mm slot 3mm slot Stock 0.075" thickness 0.115" thickness Oversized 0.078" thickness 0.118" thickness Note: 12A engines have 3mm apex seal slots, 13B engines have either 2mm or 3mm slots, RX-8 13B Renesis engines have 2mm slots. 2mm 13B seals will be restocked soon, send us an email if you would like to be notified when they are restocked.