XRAY - Model racing cars

Hi,
Tried to find which springs the 2017 kit holds, but couldn't find it.
The rumor that it have 2 different sets for front and 2 for rear, but in the manual, it shows only 1 set each.
In addition, which springs should I use for high grip Astroturf?
Thanks
Guy

In the XRAY XB4'17 presentation is correct info - in new XB4'17 kits are these springs included:

#368185 + #368285 springs for use on high traction tracks such as carpet tracks (this info is written also on the bag where these springs are packed)
#368175 + #368275

But both sets of springs, included in the box, are marked with (Front) 3 dots and (rear) 2 dots. So what is the difference??
Someone explained me that one set (the one in the bag?) is shorter so that you can achieve a lower chassis height and thus more suited for high grip.

Also, i found out that there are springs with 1 dot, 2 dots, 3 and 4 dots which are all linear if I understood correctly and then there is the set of springs with 2 stripes which are progressive.

But then what about the set of springs that has dots AND stripes?!?
Example: hudy #368182 and #368283 (1stripe, 3 dots)

Hello

1 dotz spring is softest and 4 dotz is hardest.
Then 2 dotz progressive (has much wider mark line then standart dotz).
1 strip 3 dotz is one step softer then 1 dotz