Convenient and easy to use valve action reversible tip. Dispenses 3M Primer 94 in widths of either 0.100"/2.54mm (round tip) or 0.200"/5.08mm (chisel tip). Marker is also available with 3M 4298 adhesion promoter detectable by UV light (search ASIN: B0953S3F5F). Helps increase the bond strength of acrylic and rubber based tapes. Especially helpful on Low Surface Energy (LSE) and Medium Surface Energy (MSE) substrates including common plastics used for automotive dash and interior trim applications (TPO, PPO, PP, PC, PC + ABS, etc). This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.