McVities Mars Mini Rolls are an intriguing evolutionary step for the classic and much loved Mars Bar. In layman"s terms they are a Mars Bar, but in the form of a mini roll (unsurprisingly).Each McVities Mars Mini Roll is a soft chocolate sponge bar with a sweet swirl of Mars caramel running through it, and an outer layer of delicious Mars chocolate.If you like Mars Bars, then you should give these Mars Mini Rolls a try.