Masunaga® TONA Eyeglasses by Masunaga®. Color: 35 BLUE, 23 HAVANA, 19 BLACK, Size: 50-21-145. TONA is the first aceti front in the MASUNAGA titanium series. The edgy design and the contrast between the matte and luster applied to emphasize this gives a sense of the outstanding skill and elegance unique to the series. The sharp Yoroi Temple tightens the overall impression and gives a smart impression. Despite its clean design, you can enjoy sophisticated, adult fashion, such as adding a touch of color to it.