inputs.text: buy - product definitely lives long history e6b flight computers aluminum light yet durable slide little long knee board feel like fault knee board designer still fit need two free hands isnt always doable 10000 feetthis one comes simple bifold vinyl case threw plotter compass really keeps everything contained flight bagif looking good way mark clear course correction window great luck weterase markers used overhead projectors school easily get office supply store easy see stay put quick swipe wet thumb cleans without issue dryerase markers also work brush easily