This is a Plastruct 91104 7" x .040" x 12" Styrene Sheet (Pack of 4).
Hi-Impact Polystyrene Sheet is now the second most commonly used material for general model making and vacuum forming. thin sheets may be cut by scoring with a knife, while thicker sheets should be cut with a sheet cutter. Accurately Extruded in White Styrene Plastic
Condition: Factory New (C-9) Operational Status:Functional Original Box: Yes (P-9)
Manufacturer: Plastruct Model Number: 91104 MSRP: $8.35