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Carretilha Shimano Curado MGL 70/71 HG

Style code: IT5360 The Finer Details Dimensions: 19 cm x 30 cm x 46 cm Volume: 26.4 L 100% polyester (recycled) Air mesh back panel and strap backing Multiple zip and slip-in pockets External padded laptop compartment Padded adjustable shoulder straps Side compression straps Durable TPE bottom coating

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Color & Sound:Black Gold Capsule / Perch Sound

Why do reel manufacturers go with either, for example, 4000 or 4500