Reviews on Amazon state this set to be metal weights (as opposed sand filled plastic). I think this makes it a great deal. The case is a nice touch too.
Confidence Fitness PRO Dumbbell Set with Case
Set consists of
4 x 0.8kg (1.8lbs) weights
8 x 1.6kg (3.5lbs) weights
2 x bars (weighing 2kg each)
4 x spin-on collars
Durable plastic case
Adjust the weight easily to suit the current workout or your strength level, with a recommended maximum weight of 10kg (approx 22lbs) for each bar.
£4.99 postage or free if spend over £50
You can get £1.25 off the price if going via quidco :)