ROKR Mechanical Manta Ray Review: A Great First Moving Kit

If a static display model feels too tame but a full wind-up kit feels too expensive, the ROKR Mechanical Manta Ray sits right in the sweet spot. At 108 pieces with a working motion mechanism, it is the kit we point people to when they want their first moving metal model.

What makes it different

Most beginner kits are punched from flat etched sheets and end up as static display pieces. The Manta Ray adds simple linkages so the finished model actually moves — the satisfying payoff of a mechanical kit, at a fraction of the part count of a wind-up car.

The motion is a gentle wing-flap driven by a simple crank mechanism. It is not motorized — you turn a small drive shaft by hand — and the gliding motion of the pectoral fins is the kit’s main payoff. The manta ray subject is well chosen for this: the fins are the most visually prominent part of the animal, so moving them creates an immediately convincing illusion of swimming motion. A static manta ray model would lose most of what makes the subject interesting.

The build

This is a solid Intermediate project. Expect the 108 pieces to take around two to three relaxed hours. The fiddliest moments are likely to be aligning the few moving linkages — go slowly there and the mechanism should run smoothly.

You will want needle-nose pliers and a little patience, but nothing exotic.

The mechanism assembly

The linkage mechanism is the heart of the kit and the section that requires the most attention. It connects the central drive shaft to the wing-root pivots, and it needs to be aligned correctly for the motion to run smoothly without binding.

The key is to assemble the linkage loosely at first — seat all the pivot tabs before tightening any of them. Once all the linkage pieces are loosely in position, check that the mechanism can rotate freely by hand-cranking the drive shaft gently. If you feel resistance or binding, identify which pivot is causing it and ease it slightly before tightening the rest. Tightening everything in one pass without testing is a common cause of a stiff or jamming mechanism.

Wing attachment

The pectoral fins attach at the wing-root pivots. They need to be symmetric in their rest position so that the wing-flap motion is balanced. Before locking the wing attachment tabs, hold the model by the body and check that both wings hang at the same angle — an imbalanced attachment means one wing will flap through a different arc to the other.

Mistakes to avoid

• Do not over-tighten pivot tabs; the mechanism needs free rotation, not rigid joints — the right feel is snug but smooth, not locked
• The central body spine is a long piece that needs to be straight before assembly; check it against a flat surface and gently straighten any storage bend before you start
• The tail section is purely decorative but its attachment tabs connect to the same body structure as the mechanism; make sure the tail tabs are fully seated before testing the wing motion, as a half-inserted tail tab can catch on the linkage

How it compares

The Manta Ray sits between a beginner flat kit like the Metal Earth Spitfire and a full mechanical kit like the Time For Machine car. The Spitfire is simpler and static; the Time For Machine car is more expensive, more complex, and uses a clockwork motor rather than a hand-cranked linkage. The Manta Ray is the logical intermediate step if you want to try mechanical building before committing to a premium-priced clockwork kit.

For another animal kit at a similar difficulty but without the mechanism, the Metal Earth T-Rex Skeleton is a good comparison — roughly similar in build time but entirely static.

Display and photography tips

The Manta Ray looks best displayed at a slight angle rather than flat from above, so the three-dimensional body depth and the fin sweep are both visible. A blue or dark teal surface underneath reinforces the marine setting. The hand-crank mechanism is a feature, not a flaw — if you display it where people can pick it up and operate it, it becomes an interactive piece rather than just a model.

Who it is for

• Builders who have finished a beginner kit or two and want more
• Anyone curious about mechanical models but not ready to spend on a wind-up kit
• Teens and older kids (with supervision for the sharp tabs)

The verdict

The Manta Ray is the most approachable moving metal model we have researched. If you have one flat kit under your belt and want a taste of mechanical building, start here before stepping up to something like the Time For Machine car. A standout in the animals & creatures category.