Report as inappropriate

what are the capacitors or whatever the cylinders are above both of the A4988 Stepper Drivers? Part Number?

Red cable on stepper driver connected to 2 pins from 5v rail? (none of the other cables are routed in this way is why I ask)

List of items on breadboard, or pulled from website
Nano V 3.0
LCD 20x4 I2C
(2X)Nema 17 Stepper Motors
(2x)A4988 Stepper Driver
Resistor - 220 ohms
optocoupler - PC817 (model)
3 buttons
5v 2amp?(I am guessing on amps)
12v 2amp

Please respond with any corrections please. Thank you!