Fisher Space Pen Bullet Pen, X Mark Flat Cap, Matte Black, Ballpoint, Black Ink, Pocket Clip audioquest PQ2 or use True Wireless Stereo or use True Wireless Stereo technology to pair up speakers for an even bigger sound 000 watts RMS (500 watts for each woofer) while offering all the amenities of the classic Bullet pen design Write at any Angle: Fisher Space Pens are versatile and practical ballpoint pens that can smoothly write at any angle even upside down with reliable performance on almost any surface Write in Extreme Temperatures: All Fisher Space Pens write in extreme temperatures ranging from 30°F to 250°F ( 34° to +121°C)