TC Pro Matched Big Bore Short Spring (H23mm) Black T=5.75 (No tube). Usually the spring coil number and spring rate of each spring may vary. Even if it has been produced using the same wire. With the "TC Pro Matched Big Bore Short Spring (H23mm)", it is possible to get the exact same spring rate since both units forming the pair have been measured and matched to assure an identical and constant spring rate. With the Big Bore type (bigger inner diameter), a different but yet adaptable car feel can be reached through the whole Big Bore Spring range. Suitable for any 1/10 GP or 1/10 EP Touring Car application. Included: 4 spacers to precisely retain the springs without any extra side gap or play. Height of spring is 23mm.