This is an optional Tekno RC 70mm Front Shock Spring Set, intended for use with the NB48 2.0 1/8 Competition Off-Road Nitro Buggy Kit. This spring set extends Tekno's original black standard frequency spring lineup and is to be used with the new 2.0 buggy platform. The springs are black with a blue mark to indicate the rating and are intended to provide additional front support for high grip conditions.