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Nerf Rival Round Refill (50-Pack) Styles May Vary C1696 - Best Buy
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Review: Fake Nerf Rival Balls/Rounds (Cheaper but are they as good?) - YouTube
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left the one on the left in the melting snow, and apparently rival balls are similar to sponges. they are off brand so maybe that has something to do with it. :
3D Printable Nerf Rival Ammo by CHRISTOPHER STEELE
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Nerf Rival Ammo Comparison | 2019 Part 2 - YouTube
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