Notes:
Stiffness index is a measure of how firm a string feels upon installation. The lower the number, the softer the string; a higher number represents a stiffer feeling string. Additionally, a lower value indicates a stringbed that supplies more power, while a higher stiffness index means the player must supply the power.
Tension loss represents the total amount of string relaxation both over a defined amount of time and impact in a test environment. Values are measured in pounds, with higher values indicating a greater tension loss, and lower values represent less tension loss.
Data for Stiffness Index and Tension Loss taken from USRSA test results.
Stiffness index is a measure of how firm a string feels upon installation. The lower the number, the softer the string; a higher number represents a stiffer feeling string. Additionally, a lower value indicates a stringbed that supplies more power, while a higher stiffness index means the player must supply the power.
Tension loss represents the total amount of string relaxation both over a defined amount of time and impact in a test environment. Values are measured in pounds, with higher values indicating a greater tension loss, and lower values represent less tension loss.
Data for Stiffness Index and Tension Loss taken from USRSA test results.