The glass fiber will prevent the post from breaking and make it very resilient and it will not like a hard and numb metal post transmit stress and shock to the dentine. - It will work together with the dentine to absorb any stress or shock as it has about the same elasticity as the dentine itself. - This glass fiber is radio-opaque, allowing fast recognition on the X-Ray. - Size: #1. **For further product information, please contact Chat Support**