Centerforce 400472 Iron FlywheelClutch Flywheel Iron Flywheel Iron Flywheel; 164 Teeth; Weight 27. 5 lbs.; 2 Bolt Pattern; 13. 8 in. O. D.; 2. 690 in. Flywheel Flange; 0. 935 in. Flywheel Height; Nodular Iron; w o Counter Balance; SPECIFICATIONS: WARNING CA Proposition 65: Yes WARNING CA Proposition 65 Message: WARNINGS: This product can expose you to chemicals including Nickel compounds and dusts; which are known to the State of California to cause cancer. For more information;