Durable Lexan® resin won't melt, warp or break in extreme temperatures — guaranteed! Features 8 scales to meet the needs of all VFR aeronautical charts; nautical on one side, statute on the flip. Nauticalstatute conversion scale also included. Made in the USA.This Ultimate Micro Plotter is 8" long, making it convenient for flight bag, shirt pocket, or airplane storage. Lifetime warranty.