... .toughened glass cover,tempered glass cover 2.toughened glass(4mm thickness) & food grade silicon . 3.size:dia20cm,dia24cm,d toughened glass cover,glass cover ... ,tempered glass cover Item NO.KI-29 toughened glass coverDimensionsize:dia 20cm,dia 24cm ... for pure silicon products and mixed material products. tempered glass cover with silicon flinge