RioRand(TM) RepRap Mega 2560(Arduino compatible),RAMPS 1.4,Stepstick Pololu A4988 Stepper Driver for 3D Printer,Prusa Mendel,MakerBot Powered by RioRand advanced technology RioRand(TM) 4 x A4988 with heatsink+powerful crewdriver set+cooling fan,3D Printer RepRap Package List:1 x RAMPS 1.4 Shield,1 x Iduino Mega 2560 Board,4 x A4988 stepper driver