if placed by 12PM EST
Tension spring from Eisco Labs Assorted Spring Set (PH0115AS). Length is 25mm and diameter is 15mm. These springs are sold as a pack of 10.
The sturdy, variable sized, compression and extension springs provide the perfect tools for studying motion of mass on a spring, Hooke's Law, potential energy, etc. They provide a visually and kinesthetically effective method for studying the physics of springs.