\documentclass{standalone}
\usepackage{pst-solides3d}
\begin{document}
\begin{pspicture}(-4,-2)(3,3)
\psset{viewpoint=80 -60 50,Decran=50}
\psSolid[object=cylindre,h=1,r=1,action=draw*,mode=4,fillcolor=green!20,RotX=90] (+5,+3,0)
\psSolid[object=cylindre,h=1,r=1,action=draw*,mode=4,fillcolor=green!20,RotX=90] (-5,+3,0)
\psSolid[object=parallelepiped,a=12,b=3,c=2,action=draw*,fillcolor=yellow!20](0,0,0)
\psSolid[object=cylindre,h=1,r=1,action=draw*,mode=4,fillcolor=green!20,RotX=90] (+5,-3,0)
\psSolid[object=cylindre,h=1,r=1,action=draw*,mode=4,fillcolor=green!20,RotX=90] (-5,-3,0)
\psSolid[object=cylindre,h=6,r=0.1,action=draw*,mode=4,fillcolor=gray!20,RotX=90] (-5,+3,0)
\psSolid[object=cylindre,h=6,r=0.1,action=draw*,mode=4,fillcolor=gray!20,RotX=90] (+5,+3,0)
\end{pspicture}
\end{document}