Our patch material is made from a 210d nylon fabric with a TPU coating on both sides to provide an airtight seal. These patches can be used to repair the coated(Outer) side of the tubes of our pack rafts. This can be used for all of our boat models and fabrics (Lightweight 210d, 210d, 420d, Vectran, etc.) as a permanent patch solution. Color: Black (Side One) | Arctic Blue (Side Two) Sizes: 1x 2.5in. x 8in. rectangle patch 2x 3.5in. circle patches 3x 1.75 in. circle patches Recommended Adhesive: Clifton Urethane LA4123 or Sta-bond Recommended Solvent: Acetone or MEK