Carpenter Space Pen by Fisher<div style="text-align: left;"><strong>[Product Information]</strong><ul><li class="showHiddenFeatureBullets"><span class="a-list-item"> Fisher Space Pens </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Cartridge is sealed &amp; pressurized at nealy 35 pounds per square inch </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Tungsten carbide ball </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Writes from -30 to +250 degrees F </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Writes:- On wet surfaces， On photographs， Through grease， Underwater， At any angle， Upside down </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41n6fOzHBcL.jpg" noproxy>