These innovative styli with plastic coated thread are a cost-saving alternative to standard styli. Their carbon fibre shaft is tipped with a ruby sphere and has been especially designed for the use with the VAST XXT probe. Beneath the cost factor there is the benefit, that these styli can be mounted without any tools. Compared to conventional styli, these styli have a knurled plastic adapter with titanium core. The styli can thus be screwed in and fastened by hand.