.190" Space Balls are round Rubber Balls that are used to float inside cabinet door panels to prevent splitting. Spaceballs automatically center panels in production. Use 8-10 Spaceballs per panel. Properly installed, Spaceballs will eliminate panel rattle and cracking of glue joints. Spaceballs should fit snugly, but not tight, compressing about one-half the diameter of the ball. Made from EPDM Rubber. Bulk available.