Is a 12 lb dumbbell pair good for beginners?

Yes, for many beginners it is a reasonable starting weight for lateral raises, curls and rehab-style moves. It is light for pressing and rowing, so most people will want heavier pairs as they progress.

Can the weight be adjusted?

No. These are fixed 12 lb dumbbells, so each hand always holds the same load. If you want one set that covers many weights, look at adjustable dumbbells instead.

Will the neoprene coating protect my floor?

The neoprene cover is softer than bare metal and reduces the chance of scuffs when you set the weights down. Dropping them from height can still damage floors and the coating.

What is the core made of?

The dumbbells have an iron core wrapped in neoprene. The iron gives them their weight in a compact shape, and the neoprene provides the grip surface.

Are these sold as a pair?

The set is described as a dumbbell set with a multicolor finish, which typically means two dumbbells. Check the listing details if you need to confirm the count before ordering.