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High Spiral Constant Variable Force Torque Variable Coil Spring for Cordless Shade Drive Motor. Customizable Design: Supports full customization from samples, designs, and minor adjustments. Fast Sample Delivery: Samples sent within 7 days, free of charge if tools are available. High Production Capacity: Capable of producing 3,000,000 pieces per week with advanced lines. Professional Manufacturer: Specializing in springs since 2006 with 14 years of industry experience. Competitive Pricing: Offers reasonable and competitive prices compared to other manufacturers. Quality Assurance: Features random visual and function inspection for finished products.