In Chapter 6 of All Quiet on the Western Front, for what two souvenirs do the soldiers risk their lives to retrieve from the battlefield?

In Chapter 6, the German forces are suffering heavy losses
and many men around Paul lose their lives in battle. The soldiers dive into the trenches
to retrieve bands from fired shells and slips of silk from the parachutes to keep as
souvenirs. The men see this as a form of entertainment and a way to distract themselves
from all the deaths that are around them. They keep the items because they believe they
may one day come in handy as items of trade. By this point in the war, the men do not
really see their actions as risks to their lives. Paul describes the "wasteland" of the
soldiers' lives, and many believe that all hope is already lost.