From Wiki
https://en.wikipedia.org/wiki/Table_shuffleboard
In order to decrease friction, the table is periodically sprinkled liberally with tiny beads of silicone (often referred to as shuffleboard wax even though silicone is not a wax, or sometimes as shuffleboard sand, or shuffleboard cheese, due to its visual similarity to grated cheese). These beads act like ball bearings, letting a puck slide down the table a great distance with only a slight push. There are many different speeds of wax to choose from to match the player's skill level. Powdered wax is made of silicone, cornmeal and sometimes compressed walnut shells. The longer the table, the greater speed of wax that is needed. Faster speed waxes have more silicone and less cornmeal.