1/2" x 60 yds. 3M - 214 Masking Tape. The lack of sulphur in the formulation of this tape prevents staining especially on silver and copper surfaces. Creped paper treated with a quality saturant to prevent solvent penetration. Firm synthetic rubber resin adhesive. Withstands bake cycles of up to 350 degrees F. for one hour. Elongation at break 9%. Case of 72.