It's coil over kit which developed to make up time on 1/100, 1/1000 level. It has newly designed mono-tube shock absorber with 24 steps damping force adjustment (3way 24 steps damping force adjustment with reservoir for ZERO3X)..
Putting "Carrosser works technology" which has been built through long time experience on motorsport, this is flagship model item.
Compare to traditional all round typed products (ZERO2R, ZERO2E) which are looking at usage on street to circuit (radial tyre to S tyre), ZERO3/3X's form with parts and setting specification are focus on driving at circuit with S tyre.