Specification model No. 12, 130*80*90mm; three layers of high quality No. 12, 130*80*90mm; triple-layer reinforced No. 12, 130*80*90mm; triple-layer extra hard No. 12, 130*80*90mm; three-layer super hard No. 12, 130*80*90mm; five layers of reinforcement No. 12, 130*80*90mm; five layers, extra hard No. 11 145*85*105mm; three layers of high quality No. 11 145*85*105mm; triple-layer reinforced No. 11 145*85*105mm; triple-layer extra hard No. 11 145*85*105mm; three-layer super hard No. 11 145*85*105mm; five layers of reinforcement No. 11 145*85*105mm; five layers of extra hard cardboard No. 10, 175*95*115mm; three layers of high quality No. 10 175*95*115mm; triple-layer reinforced No. 10 175*95*115mm; triple-layer extra hard No. 10 175*95*115mm; three-layer super hard No. 10 175*95*115mm; five layers of reinforcement No. 10 175*95*115mm; five layers of extra hard cardboard No. 9 195*105*135mm; three-layer high quality No. 9 195*105*135mm; triple-layer reinforced No. 9 195*105*135mm; three-layer extra hard No. 9 195*105*135mm; three-layer super hard No. 9 195*105*135mm; five layers of reinforced hardening No. 9 195*105*135mm; five layers, extra hard No. 8 210*110*140mm; three-layer high quality No. 8 210*110*140mm; triple-layer reinforced No. 8 210*110*140mm; triple-layer extra hard No. 8 210*110*140mm; three-layer ultra-hard No. 8 210*110*140mm; five layers of reinforced hardness No. 8 210*110*140mm; five layers, extra hard No. 7 230*130*160mm; three layers of high quality No. 7 230*130*160mm; triple-layer reinforced No. 7 230*130*160mm; triple-layer extra hard No. 7 230*130*160mm; three-layer super hard No. 7 230*130*160mm; five layers of reinforced hardness No. 7 230*130*160mm; five layers, extra hard No. 6 260*150*180mm; three layers of high quality No. 6 260*150*180mm; triple-layer reinforced No. 6 260*150*180mm; triple-layer extra hard No. 6 260*150*180mm; three-layer ultra-hard No. 6 260*150*180mm; five layers of reinforcement No. 6 260*150*180mm; five layers of extra hard cardboard No. 5 290*170*190mm; three-layer high quality No. 5 290*170*190mm; triple-layer reinforced No. 5 290*170*190mm; triple-layer extra hard No. 5 290*170*190mm; three-layer ultra-hard No. 5 290*170*190mm; five layers of reinforcement No. 5 290*170*190mm; five layers of extra-strength cardboard No. 4 350*190*230mm; three-layer high quality No. 4 350*190*230mm; triple-layer reinforced No. 4 350*190*230mm; triple-layer extra hard No. 4 350*190*230mm; three-layer super hard No. 4 350*190*230mm; five layers of reinforcement No. 4 350*190*230mm; five layers of extra hard cardboard No. 3 430*210*270mm; triple-layer reinforced No. 3 430*210*270mm; triple-layer extra hard No. 3 430*210*270mm; three-layer ultra-hard No. 3 430*210*270mm; five layers of reinforcement No. 3 430*210*270mm; five layers, extra hard No. 2 530*230*290mm; five layers of reinforced hardening No. 2 530*230*290mm; five layers, extra hard No. 1 530*290*370mm; five layers of reinforcement No. 1 530*290*370mm; five layers, extra hard No. 12 half-height 130*80*45mm; triple-layer reinforced No. 11 half-height box 145*85*53mm; triple-layer reinforced No. 10 half-height box 175*95*57mm; triple-layer reinforced No. 9 half-height box 195*105*67mm; triple-layer reinforced No. 8 half-height box 210*110*70mm; triple-layer reinforced No. 7 half-height box 230*130*80mm; triple-layer reinforced No. 6 half-height box 260*150*90mm; triple-layer reinforced No. 5 half-height box 290*170*95mm; triple-layer reinforced No. 4 half-height box 350*190*115mm; triple-layer reinforced No. 3 half-height box 430*210*135mm; triple-layer reinforced 10*10*10cm; three layers of extra-strength cardboard 15*15*15cm; three layers of extra-strength cardboard 20*20*20cm; three layers of extra hard material 25*25*25cm; three layers of extra-strength cardboard 30*30*30cm; three layers of extra hard material 30*30*30cm; five layers of super hard material 35*35*35cm; five layers of super hard material 40*40*40cm; five layers of super hard material 45*45*45cm; five layers of super hard material 50*50*50cm; five layers of super hard material 55*55*55cm; five layers of super hard material 30*30*20cm; five layers of super hard 40*30*20cm; five layers of super hard 40*30*30cm; five layers of super hard material 50*40*30cm; five layers of ultra-hard material 50*40*40cm; five layers of super hard material 55*45*45CM; five layers of super hard material 60*40*30cm; five layers of super hard material 60*40*40cm; five layers of super hard 60*40*50cm; five layers of super hard 60*45*45cm; five layers of super-hard material 60*50*50cm; five layers of super hard 65*50*55CM; five layers of super hard material 70*50*50cm; five layers of super hard