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Able to bend and stretch quickly to fold and stretch Thickened alloy pull rod The high-cost PC material is selected, which is characterized by softness, thinness, toughness, lightness, lightness and resistance to falling; it can ensure rapid rebound and return to the original state under heavy pressure, and the box body is not easily deformed under pressure, and is dust-proof and waterproof. The capacity of smart design is large enough ?Smooth mute wheel