Dimensions are laid out as follows Base x Top x Slope.
10" Bongo - 10 x 8 x 9, 11" Bongo - 11 x 9 x 10, 12" Bongo - 12 x 11 x 11, 13" Bongo - 13 x 11 x 11 ½,14" Bongo - 14 x 11 ½ x 12 ½, 15" Bongo - 15 x 13 x 14, 16" Bongo - 16 x 13 x 14, 17" Bongo - 17 x 14 x 15 ¼, 18" Bongo - 18 x 15 x 16