Whiting 1/4 Dry Fly Saddle is a good choice for dry fly tiers. Saddle's feathers are about 20-27 cm long, so one feather will last for 1-3 dry fly hackles. Two different models: Small is suitable for hook size #14 and smaller flies, large for #14 and larger flies.
The size of the saddle is about 4 x 30 cm. There are natural variation in colors, colors in the images are examples.