Park VP-1 Vulcanizing Patch Kit (36 to box) Self-vulcanizing fluid bonds the patch to the tube at the molecular level Each Kit Includes: (4) 25mm diameter round patches, (2) 25 x 35mm oval patches, self-vulcanizing fluid, sandpaper, and instructions in a small plastic box Packaged in master case of 36 individual patch kits The Vulcanizing Patch Kit includes six thin and flexible patches with tapered edges to blend with the tube's profile.