Home fitness equipment has quietly moved into the living room, but most of it hasn’t earned its place there. Dumbbells in particular are purely functional objects, usually made with rubber-coated iron and sold on practical merits alone. They get used, then tucked away or left on the floor because nobody really wants them on display. For most people, what’s out of sight tends to be out of mind.
Tokyo-based designer Kenji Abe knows this from personal experience. He would put his own dumbbells in a drawer when friends came over, and then forget about them entirely. That specific frustration became the brief for MANTLE, a pair of bronze dumbbells produced under the ifuki brand in Takaoka City, Japan. The goal was a dumbbell you’d actually want to leave out, all day, even on a good shelf.
Designer: Kenji Abe
That required rethinking the object from the start. MANTLE combines several surface treatments on a single cast form, with sandblasted sections contrasting against mirror-polished areas. The result carries the visual weight of a sculpture or a piece of jewelry rather than exercise equipment. Set on a side table, it reads as an intentional object, not something that ended up there because there was nowhere else to put it.
The form is just as deliberate. Inspired loosely by the armadillo, the sculptural shape is perfectly balanced, which means the dumbbell stands upright on its own without tipping. A grip tilted at 45 degrees makes it easy to pick up from any angle, and the smooth bronze surface was selected specifically to feel comfortable against skin rather than abrasive during a workout.
The versatility goes further than the grip. You can hold it conventionally for curls or presses, slide it over a wrist to add resistance to arm movements, or hook it around a foot for leg raises. The same object adapts across different exercises without needing adjustments, and the balanced form means it doesn’t fight you regardless of how you’re holding it or what you’re doing.
MANTLE also ages gracefully. Bronze develops character over time, and the combination of matte sandblasting and mirror polishing makes that aging process something worth watching. The material catches light differently across its surfaces, and the contrast in textures gives it a depth that most gym equipment doesn’t have the ambition to pursue.
MANTLE won the Grand Prize at the Toyama Design Competition in 2018 before being developed into a commercial product through ifuki. Abe’s reasoning has always been straightforward: a well-designed dumbbell doesn’t get hidden away, and one that doesn’t get hidden away is one that actually gets used. The drawer stays empty, and the habit becomes a little harder to abandon.
