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My 13 year old son wants to buy a butterfly practice/training knife. What are some good reasons not to allow him to get one? I've checked, and these knives are legal in
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Butterfly Knife Trainer - Balisong Trainer - Practice Butterfly Knife -Bundle with-Multitool 13in1 - Multi-tool with Pliers Knife Can Bottle Opener Screwdriver - - Amazon.com
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VORNNEX Practice Butterfly Knife,Full Stainless Steel Unsharpened Blade 100% Safe Dull Butterfly Knife Trainer Butterfly Knife Comb for Training(Silver): Amazon.co.uk: Sports & Outdoors
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Amazon.com: YF Butterfly Training Knife Practice Knife Trainer Dull Butterfly Trainer Comb Matte Black Finished Stainless Steel Flick for Easy Safety Folding Flip for Sport Hiking Outdoor Indoor 8.9-Inch Overall: Kitchen &
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