Yong Shin custom forged Taiwan tuna knives have been featured on youtube as the "world's sharpest taiwan tuna knife". They are custom made to order using spring steel or bombshell steel. Production time is generally 8 weeks. You can choose to add a custom made leather sheath.

Dimensions:
-- Blade: 275 x 190 x 5-10 mm / 11" x 7.5" x 0.25 - 0.5"
-- Handle Length: 100 mm / 4"
-- Overall Length: 385 mm / 15/4"
-- Weight: 1900 g. / 67 oz. ( 1.9 kg./ 4 lbs 7 oz.)

Every custom forged blade from Yong Shin shows his maker's mark, which is the 5 points arringed in a cross pattern. The additional points on either end of the mark indicate which steel type is used.  

Below are the identifying marks Yong Shin uses on his blades to show the different steel types.