An Extreme Machines press-out sticker and activity book. There are pages of activities to answer, 2 sticker pages packed with colourful machine stickers and 4 press-out pages of pieces to press-out and play with. An Extreme Machines press-out sticker and activity book. There are pages of activities to answer, 2 sticker pages packed with colourful machine stickers and 4 press-out pages of pieces to press-out and play with.