Modern O.S.FS-40S and O.S. Max 25AX Model Glow Engines and boxes: OS FS-40 Surpass ringed 4 Stroke Glow / Nitro RC Aeroplane Engine 6.49сс in pristine ex-works condition – exhaust tube etc have never been fitted – removed from packaging for photograph, complete with box and paperwork. OS Max 25AX High performance/low noise 2 Stroke Glow / Nitro RC Aeroplane Engine 4.07сс in pristine ex-works condition – Silencer, glow plug etc have never been fitted – removed from packaging for photograph, complete with box and paperwork. (2)