This is the Hop-Ups Racing Spring Set from Tamiya.

This will work for the 1/10th F201 Tamiy kit.

FEATURES: Three tensions to the spring set either Soft, Medium, or Stiff springs.

INCLUDES:

Two soft springs
Two medium springs
Twi stiff springs

REQUIRES: Tamiya F201 (TAMC0294)

SPECS:

Length: 1.37" (28.93mm)
Diameter: .38" (9.82mm)

COMMENTS: Will work only for the F201 shocks.