Double Insulated Cable
Used in many high voltage situations to ensure that copper is protected due to heavy electrical current.
Multi core Wire
Insulated copper wire used in powering and running elevators, this will have a heavy cloth insulation as well as a steel core.
Forklift Battery
Steel encased lead acid batteries, they will be bought for less than a normal car battery price.
Pewter
With many types and grades of pewter, most scrap yards will have to analyze it before giving you a price.
Solid Core Heliax
Used in cell phone systems, they have a solid aluminum core running through them along with copper on the outside.
Stainless Steel Heatsinks
Used in computers to cool them, they are often grouped in with aluminum copper radiators.
Stainless Steel Sinks
Most sinks will have a steel ring going around the bottom and will be bought lower than clean stainless.
#1 Bare Bright Copper Wire
Bare, uncoated, unalloyed copper wire free of attachments. All the insulation has been removed from the wire and it is free of solder and paint.
#1 Flashing Copper
Bare, uncoated, unalloyed copper bus bar/pipe free of attachments.
#2 Copper Tubing
Burnt copper wire, copper with light tin coating or solder.
AL Extrusion
Must not contain other alloys of aluminum and be free of zinc corners, iron attachments, felt, plastic, paper, cardboard, and thermo break.
Aluminum Boat
Many boats will have wood, debris, foam, or other contaminants in them. It is recommended you clean out all non-aluminum items to maximize your returns.
Aluminum Diesel Tank
The fuel tanks off of diesel trucks, make sure that there is a hole cut in it and that it was drained correctly.
Aluminum Engine Block
From cars, trucks, other vehicles, make sure that they are free of oil and remove plastic attachments.
Aluminum Transformers
Has a steel core with aluminum windings surrounding it. Could have an outer case surrounding the aluminum as well.
Aluminum Wire w/Steel
Clean aluminum wire can sometimes have a steel core going through or around it. Use your magnet to find out.
Christmas Lights
Separate these from other wire due to the higher plastic content from the bulbs and other insulation.