Synchroniser rings with carbon - fibre friction linings improve durability while also optimising the response time during manual gear - changing — the ideal basis for ambitious laps on cordoned - off race tracks. (ausmotive.com)
Yes DCT transmissions have synchroniser mechanisms just like manual transmissions and they work the same. (mechanics.stackexchange.com)
If there is a speed difference between the sleeve, synchroniser hub and gear, the sleeve is blocked by a «blocker ring» to prevent further travel of the sleeve, the synchronizer ring creates friction to help match gear speeds. (mechanics.stackexchange.com)