Set of 4 Add-On weight plates for the REP x REPIN Fast Series Adjustable Dumbbells. Each plate is 2.5 lbs. You will use 2 plates per dumbbell and this is setup for a pair of dumbbells. You will get 4 of the 2.5 lb Add- On plate plates. These plates have also been upgraded to the new low profile pop pins that secure the plates in place. Quick and easy to use. These are the original plates that come with the dumbbells from Rep Fitness. Any questions please ask.