They were to the size ordered, which is always a good start. A quick check of the video on how to fit them and the whole process was quick and painless. I'd definitely recommend using washing up liquid on the clips before inserting them into the seals (not too much). I also found a stiff piece of plastic was a great aid in pushing the clips home, saves wear and tear on the fingers especially if a new build conservatory and the window seals are very tight. The quality is very good and I did not need to make any adjustments to the "string", the tension was just right. Very pleased with the outcome, good value for money.