Normally cast iron or steel
THe rubber coating on the Avari dumbells is made to be durable and last a lifetime.
Light weight dumbells are best for seniors to use.
Dumbells can help to tone your pecs if you do the correct excercises.
When Dumbells Ring - 1925 was released on: USA: 3 May 1925
Metals of course dude.
throw in a couple dumbells in the trunk
Try a gallon of water.
sure, it makes you more strong and it funP.S. i am 12 and i lift 4 pound dumbells so you ca lift 5 pounds (: ,:p
Metals and nonmetals form ionic compounds.
Non metals exists in nature . They are not made in computers.
Alloy
It would depend on what brand of dumbells you had. Some have a pin you remove to add or remove weights, others you have to unlock a screw, add a new plate, and then tighten the screw.