- Cover
- ECA-XR Solid
- Factory finish
- 500/1000 Siaair
- Color
- White
- Core (15 lb)
- Quantum Mushroom
- R.G. / Differential / Bias
16 lb 2.522 0.052 0.013 15 lb 2.563 0.052 0.013 14 lb 2.642 0.044 0.010 - Release date
- August 7, 2018
- Balls with the same cover
- These balls have the same ECA-XR Solid cover as the Quantum Bias Solid:
- Balls with the same core
- These balls have the same 15-lb Quantum Mushroom core as the Quantum Bias Solid:
- From the manufacturer
Quantum Bias is the first asymmetric ball in the Quantum line. Our ECA-XR coverstock combined with the Quantum Mushroom High RG Asymmetric core gives strong hooking motion with excellent pin carry on oily lane conditions.
| Name | Core (15 lb) | Released | |
 | Kingpin Rule Brunswick | Kingpin asymmetric | Jan 8, 2019 |
| Name | Cover | Released | |
 | Quantum Bias Pearl Brunswick | ECA-XR Pearl | Mar 5, 2019 |