These were a simple and good fit for my 1991 ST1100. The rubber is good quality and they held up fine all three times I had to remove and reinstall the carbs.
This worked perfectly on my 2007 Ninja 250. I left it in the freezer for a few days and when I got the old one out this just popped right in and once it was in I let everything sit at room temp for 15 mins and it was good to go.