Our molded Delrin mountain dulcimer bridge/nut pieces are brown colored and fit our pre-slotted fingerboards, or any fingerboard with 1/8" wide bridge/nut slots. The grooves molded into the top edge of our bridge/nut pieces are appropriate forboth three and four-string dulcimers.These bridge/nut pieces are 1/8" thick, 3/8" high and 1 1/2" wide.
The second photo above (with three blue diagrams) shows some of the different ways that you can set up our Delrin nut and bridge pieces. In our diagrams, the small circles above the string slots represent the strings.