I had 500 soft airvalve springs made. Why 500 you may ask. Because there was a few dollars price difference between having 20 made or 500. I was only going to make them for myself but now I will/have to sell them. I'm still just testing them and have fitted them to all my Iwatas They feel right on par with the Zolt springs. They are stainless steel and was made by an ISO 9000 accredited spring manufacturer I have now idea if that is a good thing or not). They will be sold in packs of 5 so one order will sort you out for all your guns. I'll keep you posted. Sorry, springs are no longer for sale. Our postal service is really useless and it take up to a month for parcels to leave the country. And for the price I was charging I was losing money with every single order I had to replace.