FEATURES: Aluminum body, Graphite embedded bronze/delrin sliders, stainless steel compression spring, spring loaded variable pressure from 0.3 to 1.5 lbs., 1/2" stroke or 1/4" is using high initial preload setup.
BENEFITS: Spring loaded travel compensates for any small surface height variations so tip will not get flattened. Enables consistent, high quality results. Also allows variable writing pressures for different materials..