Finally - add up to 100+ lbs to dumbbells using your own weight plates with MASS CAPS! - YouTube
Micro Gainz
PowerBlock Sport EXP Stage 2 Add On Kit, for sale at Helisports.
ADD-ON WEIGHTS
How to add 2.5lbs to solid dumbbells. - YouTube
50mm ATX Add-On Green Flex Rubber Plate 0.25 KG (Pair)
ATX Magnetic Add-on Weights - 0.5kg and 1kg
Micro Gainz 1.25LB Dumbbell Fractional Weight Plates 4 Pack- Designed for Dumbbell Training and Micro Loading, Made in USA (5.00) : Amazon.co.uk: Sports & Outdoors