3" ABS Pulley with 50mm Ball Bearing and Thumbscrew prop65 supplying a finer-gauge option for

supplying a finer-gauge option for precision resistors and standard-cell construction in physics labs

and one 1 kg mass with a 0

sized for breadboarded circuits where the standard 4mm patch wires would overrun the apparatus footprint

illustrating the primary-battery chemistry behind the Leclanche cell — the historical predecessor of the modern dry battery

each disc 37 mm in diameter and 11 mm thick

3" ABS Pulley with 50mm Ball Bearing and Thumbscrew prop65 supplying a finer-gauge option forABS plastic pulley with a 50mm ball bearing wheel, a thumbscrew clamp for rod attachment, and an 18mm attachment diameter for pulling small weights in mechanical advantage experiments.