These bulbs are frosted, with a medium A-19 base.  While they can be 
used for normal household or business usage,  they are at their best when 
used in rough handling applications - such as trouble lights, machine tools,
etc.  These bulbs are designed to hold up where regular bullbs would not survive.
They are built to take it!!  Rugged filaments an mounts inside the bulb resist
rough handling and shock.  These bulbs are normal 120 volt.

These are the differences:

*A normal bulb has an expected life of between 750 and 1100 hours.  These 
  bulbs are guaranteed  for 3000 hours!
*A normal bulb has a very thin filament.  These bulbs have a thicker 
  filament for longer life
*A normal bulb has at most one support for the filament.  Depending on the
  wattage,  these bulbs have anywhere from 4-6 filament supports.