Specifications and models
15*10*4; 3 layers extra hard,15*10*6; 3 layers extra hard,15*15*5; 3 layers extra hard,19*10*3; 3 layers extra hard,20*13*3; 3 layers extra hard,20*14*4; 3 layers extra hard,20*20*5; 3 layers extra hard,22*14*4; 3 layers extra hard,22*15*6; 3 layers extra hard,23*16*5; 3 layers extra hard,25*20*7; 3 layers extra hard,25*25*5; 3 layers extra hard,26*15*4; 3 layers extra hard,27*16.5*5; 3 layers extra hard,30*20*5; 3 layers extra hard,30*20*8; 3 layers extra hard,30*22*5; 3 layers extra hard,30*26*6; 3 layers extra hard,32*23*4; 3 layers extra hard,33*23*7; 3 layers extra hard,36*26*4; 3 layers extra hard,36*26*6; 3 layers extra hard,38*28*7; 3 layers extra hard,40*30*6; 3 layers extra hard,40*30*8; 3 layers extra hard,45*35*8; 3 layers extra hard