Rubber sleeve is aging, you need to be careful not to tear it. About TK-1(china)/Gsh-4MS(Russia). It is an old stock and has a little musty smell. You can put it in the sun for several days to remove it. (some countries in South America need more time).Please request revised invoice when you are finished shopping. I will send you a combined invoice. The item "Air Force High Altitude(30000ft) Mig-21 Fighter Pilot Flight Helmet, nice Helmet" is in sale since Wednesday, December 9, 2020. This item is in the category "Collectibles\Militaria\Militaria (Date Unknown)\Air Force". The seller is "felicia567" and is located in China,shanghai. This item can be shipped worldwide.