Felt pad is used after the punch processing sheep blankets made of sealing washer. Having a sealing, oil storage, such as earthquake action.

毛毡垫是采用羊毛毡经过冲床加工制作而成的密封垫圈。具有密封，储油，防震等作用。

youdao

Murray did a good job of consolidating his lead but was denied the satisfaction of sealing the win when Stakhovsky, rather strangely, felt he could not continue when just two points from defeat.

BBC: Murray edges through Dubai opener