Manufactured by Midcoast Mfg. and Supply, PANEL BUDDIES™ are the first choice of professional woodworkers across the country. Unlike other panel expansion spacers  PANEL BUDDIES™ are made from specially sized foam rubber. They allow maximum expansion and contraction with out putting excessive pressure on the joints and allowing the panel to naturally center itself. You'll find your doors sound and feel more solid, eliminating the aggravating rattle associated with contracting panels. Sizes for every possible application including passage doors. Custom orders welcome!