Classification of badminton ball heads Generally, badminton ball heads are divided into four categories: foam ball heads, double ball heads, triple ball heads and all-natural cork ball heads. Foam ball heads are generally used for low-grade balls, which are relatively rare. It's just a white foam. Double-pin ball head is the most common, generally it is a double-pin small particle recycled cork ball head. The first half of the ball head is small particles stuck on cork to imitate traditional natural cork to achieve the strength of natural cork, and the second half is surface fiber, which is generally expressed as: "Small particles recycled cork double-pin ball head, XXmm surface fiber" XX represents the thickness of surface fiber; There is also a cork double splicing ball head, the first half is natural cork, and the second half is surface fiber; Generally expressed as: "natural cork double ball head, XXmm surface fiber" XX represents the thickness of surface fiber. Three-piece ball head is generally natural cork+surface fiber+natural cork, so the expression of shuttle net is: X+Y+Z three-piece ball head of natural cork, X represents the thickness of upper natural cork, Y represents the thickness of middle surface fiber, and Z represents the thickness of bottom natural cork. All natural cork ball head, think about it and you will know what it means. This is usually used on top goose feather balls. Classification of badminton balls: Badminton is generally divided into goose balls, duck balls and nylon balls. Duck feather balls and goose feather balls are common in China, and nylon balls are popular abroad, and they don't need hair, hehe. So we mainly talk about the feather classification of duck feather ball and goose feather ball. There are five kinds of duck feathers commonly used in China: duck (also called naked bone, bone-eating, grain-eating, etc. ), cherry valley (also called cherry bone, etc. ), dolphin duck (also known as foreign duck, rattan duck, duckling, etc. ), Taiwan Province duck (basically called Taiwan Province duck) and water duck (the most common duck feather). On the whole, the flapping resistance decreases in turn, but it is not excluded that some individuals, such as the humpback of water ducks, grow on the tip of duck wings. According to the width of wool, each wool is divided into full circle, generous, small square, unilateral and humpback (unique to water ducks). The hitting endurance increases in turn, and the flying feeling decreases in turn. Each wool is divided into 4~5 grades according to its cleanliness, curvature and thickness. There are generally two kinds of geese in the goose feather ball, one is the northeast Dashui goose, and the other is the black goose (I don't know where the Taoist priest is, but I saw him in my hometown in the south when I was a child). Goose feather balls can be roughly divided into four types: goose broadsword (also called goose unilateral, goose hunchback, etc. ), goose knife hair (also called goose round hair, goose round hair), goose straightening (also called goose nest hair) and goose bleaching (black goose hair bleached to white) decrease in the order of beating resistance. Flying geese are the best, and straightening and bleaching geese are ok. After all, it is also a round piece of wool ~ ~ Goose is a bit one-sided, but he is a well-deserved king. Goose feathers are the same as duck feathers, and each feather is divided into 3~5 grades.