Krytox GPL 205 GRADE 0 (AKA: Krytox 205g0) is a thick semifluid grease mixture. It is recommended for use in linear switches (but some tactile people love it as well!). If applied correctly, 205g0 is the pinnacle of the “buttery” feel and sound. When done right, the end result is an amazingly smooth switch, with a very identifiable THOCK sound.
Upgrade Keyboards only ships in thick glass jars with foam lined lids and shatter resistant heat shrink to prevent breakage and seepage in shipping.