Back before the days of internet we used to rack these off of glass cleaner. other than NYO's this is about all you could get back then. Since there was no graff shops anywhere you can imagine how tight it was to come up on these bad boys. This was definitely the Cap of choice for UFB. But that's history now. This is the Modern era of fancy low pressure cans homiez!! Lucky for us this cap has weathered the test of time by being the perfect cap for Molotow. Its a great pressure sensitive outline cap for all around use. if you really open up the valve its perfect for filling! And at $6.89 for 100 you would be stupid to waste the time to rack them. I guarantee you will not find them cheaper anywhere on the net. Cop these Son!