<https://www.power-systems.com/shop/product/hex-dumbbell?entityname=manufacturer&entityid=43#Product>
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" Rubber hex head design is gentle on floors and won't roll away. Sold in pairs.&nbsp; &nbsp; Features: SOLD IN PAIRS Solid steel knurled ergonomic handle with zinc coating for improved grip, comfort and durability Raised numbers make each dumbbell easy to identify by weight Rubber hex head design prevents the dumbbell from rolling away so they stay within easy reach"
<https://www.power-systems.com/shop/product/hex-dumbbell?entityname=manufacturer&entityid=43>