STJ Head Inc. is a sister company of Headstart Construction Inc. which manufactures a clear composite airtight unit used in Pharmaceutical, Bio-Tech and Electrical 'clean-rooms' where environmentally controlled rooms are paramount. This window is called "Performance Pro"

Performance Pro windows are also showing further benefits for:

1. interior / exterior residential and commercial windows where heat
   loss is of concern (i.e. far north construction)
   
2. sound control (recording studios) is desired.