The shuttle may be made from natural, synthetic or other manufactured product or any of those combinations. The feel on the racket and the flight characteristics, generally, should be similar to those produced by the natural feathered shuttle, which has a cork base covered by a thin layer of leather.
4.Having regard to the principles:
4(a) General Design4(a)(i) The shuttle shall have 14 to 16 feathers fixed in the base.
4(a)(ii) The feathers can have a variable length from 64mm to 70mm (2 1/2 inches to 2 3/4 inches), but in each shuttle they shall be the same length when measured from the tip to the top of the base.
4(a)(iii) The tips of the feathers shall form a circle with a diameter within a range of 58mm to 68mm (2 1/4 inches to 2 5/8 inches).
4(a)(iv) The feathers shall be fastened firmly with thread or other suitable material.
4(a)(v) The base shall be:
-25mm to 28mm (1 inch to 1 1/8 inches) in diameter
-rounded on the bottom.
The shuttle shall weigh from 4.74 to 5.50 grams (73 to 85 grains).
4(c) Non-Feathered Shuttles
4(c)(i) The skirt, or simulation of feathers in synthetic or other manufactured materials, replaces natural feathers.
4(c)(ii) The base is described in paragraph 4(a)(v).
4(c)(iii) Measurements shall be the same as in paragraph 4(a)(i)-(iv). However, because of the difference in the specific gravity and behavior of synthetic and manufactured materials in comparison with feathers, a variation of up to 10 percent in the stated measurements is acceptable.
4(d) Pace and FlightA shuttle shall be deemed to be of correct pace when it is hit by a player with a full underhand stroke from a spot immediately above one back boundary line in a direction parallel to the sidelines and at an upward angle, to fall not less than 530mm (1 foot 9 inches) and not more than 990mm (3 feet 3 inches) short of the other back boundary line.
4(e) Modifications subject to there being no variation in the general design, pace and flight of the shuttle, modifications in the above specifications may be made with the approval of the national organization concerned:
4(e)(i) in places where atmospheric conditions due either to altitude or climate make the standard shuttle unsuitable; or
4(e)(ii) if specific circumstances exist which make it otherwise necessary in the interests of the game.
"IBF" approved tournament grade goose feather shuttlecock, speed 76, 77 and 78, white or yellow colors. Made in Taiwan, 100% quality control, Satisfaction guarantee, 100% *refundable.