Simple Machines Block & Tackle sensors) This 10-piece set includes 10

This 10-piece set includes 10 different math-themed stamps: numerals 0-9

UPC: 710858012390

The Pistol Lanyard is ideal for law enforcement

and removable shoulder straps

Simple Machines Block & Tackle sensors) This 10-piece set includes 10MPN: 005646 UPC: 895452001480 One pulley can be used to change the direction of the force applied by a cord several pulleys can be used to make this simple machine. A small force on the cord can be used to lift a large weight. Experimenting with the device shows why: lifting the block by a short distance requires that the cord be pulled a long distance. This classic wooden model offers children a basic concept of the laws of physics. Desktop sized.