Whiting Hebert Saddle is good choice for dry fly tiers. Saddle's feathers are about 25-30 cm long, so one feather will last for 1 - 3 dry fly hackles. These feathers are suitable for about hook size #10 - #16 dry flies.
The size of the saddle is about 13 cm x 40 cm. There are natural variation in colors, colors in the images are examples.