DUNLOP JD925 DOBRO Type Ergo Tonebar 5.35 oz. Steel Guitars of Canada » Online Store » Accessories » Bars » DUNLOP JD925 DOBRO Type Ergo Tonebar 5.35 oz. Dunlop JD925 DOBRO Type Ergo Tonebar Standard Grooved 5.35 oz., 5/8" x 2 7/8". This is the standard grooved tone bar (Stevens type) usually used with Resonator (Dobro) type guitars. Price: $54.00 Updating cart...