Our 130mm, oil-filled, aluminum shocks are the perfect solution for incorporating a suspension setup into your Actobotics project! The shock body is threaded so that you can adjust the spring tension simply by rotating the spring perch. Progressive rate springs allow you to dial-in just the right amount of pressure. Both ends incorporate a 0.140 bore ball swivel so that you can mount the shocks at various angles for smooth operation without binding. The long 1.45 stroke length means you can maximize the moment arm. The shocks can easily be disassembled for cleaning or adding various viscositys of oil to change the dampening. We recommend using 6-32 x 3/8 long standoffs to space the shock body properly when mounting to flat surfaces.