Professional results that a DIYer can be proud of begins with 394 General Purpose Duct Tape by Nashua. This duct tape measures 9 mils thick while delivering value and performance, making it the perfect choice for common household repair applications. Suitable for seaming, patching, bundling and sealing, it bonds to a variety of both rough and smooth surfaces for versatile use. Nashua Tape. Trusted by professionals. DIY approved. Count on Nashua to get the job done right. Color: Grays.