The Gretsch USA Custom Microsensitive butt plate is a modern update to the classic Gretsch Microsensitive from the 1950s and 60s. Improvements have been made to internal mechanisms for solid, dependable functionality. Made from heavy-duty zinc alloy and will fit the original hole patterns, which allows drummers to retrofit their original butt. The Microsensitive system is dual tensioning. Macro ¥stepÕ adjustments are made with the small knob on butt plate. The butt plate attaches to shell with single post. Uses key screws for the strainer plate.