A pilot-controlled electromagnetic valve system has an electromagnetic valve block mounted on the top of a manifold block. The peelable blend of the second core layer may contain from 20-80 wt % of a polyethylene and from 80-20 wt % of a polyolefin incompatible with polyethylene, or it may contain from 10-35 wt % of ethylene-\u03b1-olefin elastomer and from 90-65 wt % of propylene homopolymer. The semiconductor memory device may comprise a substrate comprising an upper layer.