The Stage 4400RP is a low cost stage that offers 4" x 4" of travel in a thin (.75" thick) X, Y stage.
The Stage 4400LS is a low cost good quality stage that offers 4" x 4" of travel in a thin (70mm thick) X, Y stage.
The Stage 4400BS is a premium quality stage that offers 4" x 4" of travel in a thin (70mm thick) X, Y stage.
The Stage 4400 is a low cost Manual Stage, that offers 4" x 4" of travel in a thin (1" thick) stage.