vokey wegdes

why do some vokey wedges have bounce numbers and some dont? ive been looking at some and they dont have a bounce i was just wondering is there any differance.

I may be wrong but i believe it is the difference in the milling of the clubs and the groves that produces the bounce

All of the SM4 wedges wit hthe exception of the TVD series state the bounce as part of the description; 258-09 is a wedge with 58° of loft and 9° of bounce.

The grooves have nothing to do with the bounce of the wedge.