Durability that can't be matched! Made from cast iron in a hex shape design and encased in virgin rubber to Resist cracking, 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. Available from 3 to 120lbs. Chrome Contoured Handle See SKU #SDRS for Dumbbell Sets The Body-Solid logo appears on dumbbells made in 2014 and after Body-Solid Dumbbell Storage Rack Width To calculate how much space you need. Note: You will need slightly more space than the exact width of each dumbbell head Number of Tiers Width of Each Tier SDKR 1,2 or 3 59.5" GDR60 2 or 3 56" GDKR100 1 or 2 39" GDR363 3 38" PDR282X 2 28"