Abstract: A method for making a sponge rubber of a table tennis racket contains mixing at least two prescriptions together to form at least two mixed rubbers; rolling the at least two mixed rubbers on at least two rolling machines respectively to roll the mixed rubbers into at least two laminated prefabrications; piling at least two prefabrications together to eliminate air between the prefabrications so that the prefabrications contact with each other tightly; cutting a piled prefabrication into a plurality of units with a proper size; vulcanizing a cut prefabrication in a mold to obtain a single-layer sponge rubber.

Abstract: The table tennis bat with adjusting gravity mechanism of the present invention, whose center of gravity can be varied dependent on player's habitual behavior or usual practice to be suitable for each table tennis player's demand, comprises a blade body, an upper handgrip part, a lower handgrip part, an adjusting gravity mechanism, and an adjusting knob. Which adjusting gravity mechanism is included a hollow rectangular frame, a lead screw and a slider block. The slider block is used as counterweigh when removed capably to vary the center of gravity of table tennis bat of the present invention. Accordingly, when the slider block is driven to have a forward displacement the center of gravity of table tennis bat of the present invention is varied forward. Similarly, when the slider block is driven to have a backward displacement the center of gravity of table tennis bat of the present invention is varied backward.

Abstract: The table tennis bat with adjusting gravity mechanism of the present invention, whose center of gravity can be varied dependent on player's habitual behavior or usual practice to be suitable for each table tennis player's demand, comprises a blade body, an upper handgrip part, a lower handgrip part, an adjusting gravity mechanism, and an adjusting knob. Which adjusting gravity mechanism is included a hollow rectangular frame, a lead screw and a slider block. The slider block is used as counterweigh when removed capably to vary the center of gravity of table tennis bat of the present invention.