GREEN PRODUCT, SAVE THE PLANET!!!! YOU ARE BUYING 30 CORK RING WITH 1 1/2"(DIAMETRO)X1/2"(TICKNESS) GRADE EXTRA WITH BORE 1/4", THIS IS THE BEST GRADE YOU CAN FIND MADE WITH PORTUGUESE CORK. MY GRADE SISTEM IS:(FROM BETTER TO LOWER GRADE)FLOR, EXTRA, A+, A AND B
