This is a matched set and includes the exact barrel blank and insert blank shown in the picture. Barrel blanks are 3″ +/- 1/8″. The outer diameter is 1.610″ and the hole is bored at 5/8″ (.625). Insert Blanks are 4.5″ +/- 1/8″. The tenon is .625′ in diameter by 2.5″ with a 1/4″ taper at the top. The top cylinder is 1 5/16″ in diameter and roughly 1.5 to 1.75′ long. Due to the casting process, there may be minor surface imperfections and minor truing of the blank and/or tenon may be necessary although these should not effect sound quality. Due to the casting process, inner bore may not be perfect center so minor truing of the blank may be necessary. Please read our Acrylic Info page for all information about our blanks.