The short answer
Cube or chunk center
A fuzzy dice bait starts with a compact block of soft plastic. Strands or skirt material pass through or project from that center.
Round center
An urchin-style bait uses a round or ball-like center body with soft arms radiating outward around it.
That distinction is not a fishing-law definition. Manufacturers use names differently, and the category is still evolving. It is simply the most useful plain-English way to tell the two branches apart.
What makes a fuzzy dice bait different?
The cube gives the bait flat sides, corners and a compact blocky center. Early dice-style designs often used skirt strands threaded through the body, creating the fuzzy appearance that gave the category its name.
Current dice baits range from literal cubes to more rounded chunks and stick-like shapes with strands. The closer the bait gets to a sphere, the more the terminology starts to blur.
What makes an urchin or spiky-ball bait different?
The center is round. The arms usually project in many directions from that ball-like body, creating the “spiky ball” silhouette anglers now use as a plain-English description.
Some round urchin baits are made from durable elastomer/TPE-style materials rather than conventional soft PVC. That matters for stretch, buoyancy, storage and how the bait behaves around a hook or weight.
Why anglers group them together
They solve many of the same problems. Both give fish an unusual compact profile with movement in several directions. Both can be fished with very little angler input. Both show up around modern finesse fishing, forward-facing sonar, drop-shotting, hovering and light bottom-contact presentations.
That is why current retailers and fishing publications increasingly use umbrella language such as “dice, urchin and fuzzy-style baits.” Bassmaster has also described two main fuzzy-bait categories: dice-style soft plastics with skirt material and the round urchin/spiky-ball style.
Where “fuzzy bait,” “fuzz ball” and “Coike” fit
Fuzzy bait
A broad umbrella term. It can include both dice-style and urchin-style designs because both use a compact center with lots of appendages or strands.
Fuzz ball / ball of fuzz
Informal descriptions that anglers and fishing media use for the overall look. Depending on context, they may refer to a true cube-style fuzzy dice or a round urchin-style bait.
Coike
A specific product family/name associated with Hideup, not the generic name for the entire bait category. Anglers sometimes use the name loosely because those baits helped popularize the profile, but it is better to use “urchin,” “spiky ball,” “fuzzy dice” or the actual product name when describing other makers.
Does the difference change how you fish them?
Sometimes. A blocky PVC dice bait and a buoyant round elastomer urchin may need different hooks, weights and storage even if both are being fished around the same fish. Shape is only one variable; material and salt content can matter just as much.
That is why our rigging guide starts with the actual bait behavior rather than a rigid formula.
Read: How to Rig Fuzzy Dice Baits →