Durability that can't be matched! Contoured chrome knurled handles, from 1 to 25 Kg. Made from cast iron in a hex shape design and encased in virgin rubber to resist cracking and fading. Prevents rolling and protects floors and equipment. The ends are cast with a through hole to secure to the handle. The final step is to over-mold with rubber onto the end weights. Sold individually. There may be a small variance in the actual weights of dumbbells and weight plates. Tolerance is +/-3% when weight is greater than 9 Kg. Tolerance is +/-5% when weight is under 9 Kg.