Gravity mats are plastic inserts for retail and fridge shelves. They use gravity to push bottles, cans, and boxes forward after one is taken. No springs. No motors. Just a smooth HDPE surface and a small slope.

A gravity mat sits on a shelf inclined by about 6° to 9°. As each item is removed, the one behind slides into place. Staff only refill at the back. The mat does the rest.