This Molded Rubber Piston Kit (Performance) is a must-have for any car enthusiast looking to enhance their vehicle's performance. The kit, which includes a Piston Kit, is designed for 4L60E and 4L65E transmissions. The material used in this kit is high-quality molded rubber, making it durable and long-lasting. It is ideal for those who want to upgrade their car's transmission without sacrificing quality. Engineered utilizing best-in-class materials. Meets or exceeds OEM specifications. Better temperature range. Higher tear strength. Better bonding characteristics. Designed for better seal support.