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The spine of an arrow is a measurement of its stiffness. It's is a number given in 1000ths of an inch of deflection given a certain amount of pressure. There is a great article detailing the speci...
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The spine of an arrow is a measurement of its stiffness. It's is a number given in 1000ths of an inch of deflection given a certain amount of pressure. There is a great article detailing the speci...