Custom J-Cup Liners by Mammoth Upgrades

It’s your rack. Customize it.

  • Single Color

  • American Flag

  • Custom Text

  • Custom Logo

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Select your J‑Cup

How do they compare to typical J-cup Liners?

Feature Mammoth Upgrades Liner Typical Liner
Material Thermoplastic Polyurethane UHMW Plastic
Shore Hardness 68D 60-70D
Failed Rack Protection ✓ ✕
Finish Protection (Cerakote/Zinc) Excellent - Elastic Pressure Distribution Moderate - Rigid Point Loading
Acoustic Profile Impact Dampening - Quieter Impact Reflective - Louder
Barbell Stability Moderate Friction Low Friction
Colors 7 ✕
Text, Designs, and Logos ✓ ✕
Stock
Custom

Extra Barbell Protection

All Custom J-Cup Liners add protection around the end of the J-cup. Everybody occasionally fails at racking the bar. Protect your knurling the next time it happens.

Interested in even more customization?

Want your logo, or something crazy on your J-cups? Let’s make it happen. Shoot us an email at support@mammothupgrades.com for a free quote and our design guidelines.