STEM Kit - Decorated with seaspray patterns and leather nameplate.The mirror cover is designed as the combine of a rudder and a skull.A real monocular telescope diy kit for adults and kids. 165 yds Sight Distance - Equipped with a 0.8 inch eyepiece and a 1.2 inch objective.You can zoom in the views by adjusting the retractable body tube.It will be a fun 3D puzzle for adults and kids. Package Contains - 314 wooden parts.A detailed how-to booklet.All the tools you need.It will take about 2.5 hours to build up this 3D puzzle for adults. Quality Throughout - Utilize selected basswoods from high latitude. German laser-cut technology makes the error of each piece less than 1/5000 inch. Spare parts are contained for accidental damage and loss.