AMMO by MIG Accessories SOFTOUCH VELVET MASKING TAPE 2 (6mm X 25M)

From the Manufacturer:

Adhesive tape for masking, low adhesion and high quality for precision work.

Perfect for airbrushing as this tape prevents paint from seeping through, allowing you to draw any contours required. VELVET Masking Tapes leaves no trace on any surface, including the most delicate paints including bare metal and metallics. It can also be used over decals, as it is extremely gentle on surfaces and designed for such tasks. This masking tape can be easily cut with scissors or directly on the model delicately using a fine tipped blade.