XMark Adjustable Dumbbell
Dumbbell? More like SMARTbell! Wait, no, that doesn't fit, because this dumbbell isn't smart, just versatile. It adjusts to be many dumbbells in one. So let's try that again. Dumbell? More like CHAMELEONbell! Hmm. Maybe this just isn't our day.
Xmark Fitness official site