American 3B Scientific U40816 Spring Set for Hooke's Law (Pack of 5)

American Educational Brass Hooked Weight Set with Hanger, Metric

United Scientific WDSET1 Wave Demonstrator Set with Two Helical Springs and Cotton String

Neiko Steel Spring Shop Assortment - 200 Springs in 20 Sizes/Styles

Eisco Labs Spring Set for Studying Hooke's Law - Set of 5

Expo Low Odor Chisel Tip Dry Erase Markers, 4 Colored Markers [80174] (Pack of 4) Total 16 Markers

EISCO Pith Electroscope on Plastic Base

Eisco Labs Light Box - 27 Piece Optical Kit, Covering 18 Topics in Optics with Full Activity Guide