Many tenkara anglers in Japan favor larger flies, even for trout in mountain streams. Larger flies are more visible to fish in faster flowing water and give them a better opportunity to see the fly. The potential high calorie intake is often too much for trout to resist.

Particularly effective in fast water, or when the bugs are bigger, this size of fly should be in every tenkara angler's fly box. The Oki Kebari (literally "Big Fly") is a pattern developed by Tenkara USA® founder, Daniel Galhardo. It combines several attributes from tenkara flies he's learned from different teachers: larger size, soft hackle and peacock herl collar on a barbless hook. The forward-facing hackle also ensures a very lively fly underwater. This tenkara fly can be a very effective "secret weapon".