Electrode support, It is built to connect to all standard ring-stand posts; its large-handled locking nut keeps your sensors firmly in place, great complement to the Stir Station, as well as a perfect holder for many sensors
Rolling friction car kit, provides four cars for exploration into the force of friction, Each car provides a set of different material wheels (wood, fabric, soft rubber, soft silicone), Weight (lb): 1.0, Length (in):5.8, Width (in):6.5, Height (in):3.5