**Product Specifications:**

Brand: RSL

Model: 928

Description: High quality badminton shuttlecocks designed for stability and durability

Quantity: 12 pieces per tube

Material: Composite cork, goose feathers

Speed: 77

Features: Thick and high-quality feathers, straight and sturdy feather shafts

Testing: Feather resilience test, stable flight performance

Construction: Composite cork head for durability, straight feather shafts for strength

Packaging: Super fiber PU material for increased durability and wear resistance

Authentication: Scratch-off label with unique verification code for authenticity check on official website (www.rsl-1928.cn)

**Additional Information:**

Selection guide for choosing shuttlecocks based on flight stability and durability

Categorization by feather shape and material for different performance levels

Official website for product authentication: www.rsl-1928.cn, enter scratch-off code for verification

(Note: The information provided has been summarized and organized into product specifications format.)

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