Yamamoto Uni Mas 20mm

When Size Matters — The Uni Gets Bigger

The original Yamamoto Uni already had a cult following among finesse bass anglers. The Yamamoto Uni Mas 20mm takes everything that made it great and scales it up — a larger 20mm body with the same multi-appendage design that pulses, shimmies, and flutters with the slightest movement. When you need a more visible profile to get noticed in deeper water, stained conditions, or when targeting bigger fish, the Uni Mas is the answer.

The Uni Platform, Evolved

Built on Yamamoto's proven TPE formula, the Uni Mas delivers the same durability and lifelike action as the original Yamamoto Uni — but with a presence that commands attention. Each bulbed appendage catches water independently, creating a chaotic, multi-directional shimmy on the fall that no single-tail or paddle-tail bait can replicate. Whether you're fishing it on a slow, methodical drop or snapping it with sharp rod twitches, the Uni Mas responds with action that triggers reaction strikes.

Why Standard Finesse Baits Fall Short

Conventional drop shot baits — straight worms, minnow profiles, small craws — produce predictable, linear action that pressured bass have learned to ignore. The Uni Mas changes the equation with its urchin-style appendage design: every appendage moves independently, creating an erratic, lifelike profile that looks alive even when the bait is sitting still. In clear water or on heavily pressured fisheries, that difference is the difference between getting bit and going home empty-handed.

How to Rig It

The Uni Mas is purpose-built for finesse presentations. Nose-hook it on a drop shot rig below a VMC Tungsten Tear Drop Shot Weight for a suspended, pulsing presentation that drives bass crazy on slack line. For neko rig, insert a Reins TG Tungsten Nail Sinker into the nose for a head-down shimmy on bottom contact — deadly on rocky points and hard-bottom structure.

The Right Pick If...

• You want a larger urchin-style bait for deeper water or bigger fish
• You fish drop shot or neko rig on pressured bass fisheries
• You're targeting largemouth, smallmouth, or spotted bass in clear to stained water
• You want to step up from the original Uni when fish want a bigger profile
• You need a finesse bait that produces action even when sitting still

Best Fishing Techniques

• Drop shot — nose-hook below a tungsten weight for a suspended, pulsating presentation; shake on slack line for maximum appendage action
• Neko rig — nail weight in the nose for a head-down shimmy on bottom contact; great for rocky structure and points
• Wacky rig — hook through the center body for a fluttering fall around docks and laydowns
• Shaky head — thread onto a light jig head for a bottom-hopping presentation with constant appendage movement

Best Conditions

• Clear to lightly stained water where subtle, natural action triggers bites
• Pressured fisheries where finesse presentations outperform power fishing
• Deeper water (10–30+ ft.) where a larger profile gets noticed on the drop
• Post-frontal conditions when bass are finicky and slow to commit

Best For

• Species: Largemouth bass, smallmouth bass, spotted bass
• Techniques: Drop shot, neko rig, wacky rig, shaky head
• Gear: Light to medium-light spinning, 6–10 lb. fluorocarbon or braid-to-fluoro leader

Key Features

• 20mm body — larger profile than the original Uni for deeper water and bigger fish
• Multi-appendage urchin design — each arm moves independently for erratic, lifelike action
• Yamamoto TPE formula — durable, buoyant, and responsive to subtle rod movements
• Produces action even when sitting still on slack line
• Available in 9 proven colors for clear to stained water conditions
• Freshwater application

Models & Specs

Tackle Express Tips

• Start with Green Pumpkin or Watermelon Red in clear water: These natural colors are your go-to in clear conditions. Step up to Black & Blue or Pearl Hologram in low-light or stained water for more contrast and visibility.
• Size up from the original Uni when fish go deep: The 20mm Uni Mas has more presence at depth than the original Yamamoto Uni — if you're marking fish on your graph but not getting bites, switching to the Mas often makes the difference.
• Shake, don't jerk: On a drop shot, subtle rod tip shakes on slack line produce the most appendage action. Aggressive snaps can cause the bait to spin — keep your movements small and let the bait do the work.

FAQ

What's the difference between the Yamamoto Uni and the Uni Mas?
The Uni Mas features a larger 20mm body compared to the original Uni, giving it a bigger profile and more presence in the water. The Mas is the better choice for deeper water, larger fish, or when you need a more visible bait in stained conditions. The original Yamamoto Uni is the go-to for ultra-finesse presentations in clear, shallow water.

How many come in a pack?
The Yamamoto Uni Mas is sold as a single bait — 1 per pack at $17.99 — allowing you to pick exactly the colors you want without committing to a multi-pack.

What hook size works best for drop shot rigging?
A size 1 or 1/0 drop shot hook works well with the 20mm Uni Mas. Nose-hook it through the top of the body to keep the appendages hanging freely and maximize action on slack line.