Sheets 18 by 18" for Birkenstock style sandals Thickness is 10 mm This rubber could be used to resole Birkenstock brand shoes. Soling Rubber Sheets Replacement Resole Black Brown 18 by 18" for Birkenstock style sandals The rubber replacement sheets come in three colors black, brown and white. The thickness is 10 mm. This rubber could be used to resole Birkenstock brand shoes. Made from EVA it is flexible, durable, lightweight and shock resistant. From the sheet of this size you could resole 4 - 5 pairs (depending on size) of the sandals. These rubber sheets are manufactured for Birkenstock style sandals but are not the Birkenstock brand. This rubber sheet will be shipped rolled up. To make it flat again just roll it on the opposite side or leave it flat under the wight overnight.