Amazon.com: RockTape RockBalls Infinity Dual-Action Fused Massage Balls, Relief for Sore Muscles & Joints, Roll Down Spine, or Pinch & Squeeze Muscles in Tricky Areas : Health & Household
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Perfectly round rock, baseball sized, but is it a rock used for grinding or what we always have called river rollers? W. Central Sask, Canada : r/whatsthisrock