Unbranded rear shock spring spare for the more basic rear suspension shocks I guess as it’s not a long spring it’s 350x2 measurement can be seen in the photo it’s actually a red spring but it stuck out and I sprayed it black and it’s been inside a box dumped with other parts it’s worn it away worked well on those cheaper shocks that don’t have much travel but at the time I wanted a lighter spring as the common ones that they come with are quite small and stiff for my weight would look fine with either a re spray of black or the black paint removed to show the red
