Active Hobby Products 21mm touring car springs
Coming from Japanese company Active Hobby Products is a range of 21mm big bore touring car springs. They are available as medium soft 2.4, medium 2.5 and medium hard 2.6 variant made from 1.4mm wire. The colour-coded springs promise improved steering response and rear traction while also reducing tyre degrading and they come in sets of two or four pieces per hardness and also as 6-piece combo package, containing a pair of each spring.
Source: Active Hobby [active-hobby.com]