Is this one dumbbell or a pair?

It is a set of two dumbbells, one for each hand. The 60 lb figure covers the pair, so each dumbbell is about 30 lb.

Can I change the weight?

No. These are fixed-weight dumbbells with no plates to add or remove. If you need to change loads, look at adjustable dumbbells instead.

Will the neoprene damage my floors?

The neoprene coating is softer than bare iron or chrome and is much less likely to scratch wood or tile. Dropping them hard can still mark a floor.

How does this compare with adjustable dumbbells?

It is simpler and faster to use, with no dials or collars, but it takes more space and gives you only one weight. Adjustable sets cost more and are bulkier to handle but cover many loads.

Is 60 lb enough for a beginner?

For a beginner doing curls, rows and shoulder work, yes. For presses and squats, or for anyone with training experience, it will feel light quickly.

What is the handle like?

The handle sits under the neoprene coating, so it is soft and slightly textured rather than knurled metal. That is comfortable but less secure than a machined steel grip when your hands are very sweaty.