1:  NEMA 23 Servo Motors 3 Axis CNC Kit: $909.99 A: 3 PCS Geckodriver G320 or G320X, 80V/20A B: 3 PCS KL23-130-60  (NEMA23)  Dual Shaft, 350 oz-in Peak 60V/20A C: 3 PCS  US Digital:  E4P-300-250-D-H-D-1, 1/4 Shaft -Mount Optical Encoder + 3 pcs CA-MIC4-SH-NC-6 Cable for E4P-300-250-D-H-D-1 encoder D: 1 PCS KL- 4813 : Unregulated Power Supply 625W, 48VDC/13A , Input: 120VAC or 230VAC E: 1 PCS C10 Breakout board which E-Stop or Limit Switch can be wired to 2:  NEMA 23 Servo Motors 4 Axis CNC Kit: $1130.84 A: 4 PCS Geckodriver G320or G320X, 80V/20A B: 4 PCS KL23-130-60  (NEMA23)  Dual Shaft, 350 oz-in Peak 60V/20A C: 4 PCS  US Digital:  E4P-300-250-D-H-D-1, 1/4 Shaft -Mount Optical Encoder + 4 pcs CA-MIC4-SH-NC-6 Cable for E4P-300-250-D-H-D-1 encoder D: 1 PCS KL- 4813 : Unregulated Power Supply 625W, 48VDC/13A , Input: 120VAC or 230VAC E: 1 PCS C10 Breakout board which you can connect with E-Stop or Limit Switch Mach3 Setup for Our Package Here is the specification for Breakout Board If you like to update to different driver or C11 breakout board, pls let us know