Zydeco Washboard Standard 20 Gauge"EDGE TRIM" Key of Z Rubboards Frottoir Scrubboard Percussion Instrument Free Scratchers Hand Made Louisiana Made By Tee Don Authentic Original Welcome to Key of Z Rubboards. Often Imitated,never Duplicated. The Authentic Original Rubboard since 1946. Handcrafted to perfection by a french speaking Cajun in deep south Louisiana USA. Not as loud as the traditional rubboard. 30 ribs,Special rib bending process used for that one of a kind Key of Z Resonate Sound. Much time and effort is spent on hand smoothing and polishing all edges."SHOULDER TRIM ON THIS MODEL" Ribbed playing surface 18 inches long X 13 inches wide