I-BEAM IMPACT PLA 3D Printer Filament was developed to be the strongest, easiest to print, most accurate, and most reliable filament on the market today. IMPACT PLA is not brittle like other PLA filaments because we have incorporated a proprietary blend of impact modifiers for a true high-strength 3D printer filament. I-BEAM TOUGH PLA is available in both 1.75mm and 2.85mm diameters in a variety of colors. Give IMPACT PLA a try and experience the difference.