All of our new kits since the Lost in Space Cyclops have been injected in styrene.
ABS also bears a faint rubber-like smell when compared to sytrene.
In Space Jupiter 2 are gray it is styrene. The Snap Draggins snap together cars which are molded in assorted colors and the Green Hornet's Black Beauty molded in black are all styrene. As you know most model kits on the market today are produced in styrene plastic. We at Playing Mantis chose to create our earlier model kits with ABS plastic. However certain cements formulated for styrene do not bond well on ABS material.