Rubber washers.
Included sizes:
10 washers in 14,5x24,5x2mm 20 washers in 11,5x23,5x2mm 20 washers in 10x19x1,8mm 30 washers in 6x14x1mm 40 washers in 5x10x1mm
Scope of delivery corresponds to the product photo. In assortment box.