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. Please read our Acrylic Info page for all information about our blanks.