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Amazon.com : FAST- DEER Carbon Fiber Seat Post Mountain/Road Bike Seat Tube 3K/UD Matte, Offset 20mm,Diameter 31.6/30.9/27.2mm,Weight 165g (30.9X350MM, UD) : Sports & Outdoors
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Amazon.com : Satori Trident of Road Bike Bicycle Carbon Fiber Aluminum Alloy 18mm Offset Setback Seatpost Seat Post with Adjustable Clamp 30.9mm x 350mm : Sports & Outdoors
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