The M-159B-RTW has a tip size of .04" x .038". These miniature straight soft replaceable tip 4.45" long tweezers feature Acetal tips which are electrically insulative and resistant to temperatures up to 185°F. The bodies are made of anti-magnetic Neverust® stainless steel (AISI 316L). Excellent for cleanroom applications and for avoiding the marring or scratching of items being handled. Will not scratch or marr delicate items.