Black Iron Strength Poles Apart Dumbbells have revolutionized the way you view dumbbells! Incorporating their patent pending poles apart magnetic technology, they allow you to add an exceptional range of weight to your dumbbells and give you greater control over your workouts. Just place the magnetic addon weights on each side, twist in place and you are good to go. When you are done or want to change increments, just twist and disengage the addon and swap it for another! Gain valuable floorspace and consolidate your dumbbell area by incorporating Black Iron Poles Apart Dumbbells into your facility!