... cover 2.toughened glass(4mm thickness) & food grade silicon . 3.size:dia20cm,dia24cm,d toughened glass cover,glass ... dia 24cm,dia28cm,4mm thickness MaterialFood grade silicon&toughened glassColorAny color for silicon ringe is available.LogoSilkscreen logo,embossed ... experience on developing new design for pure silicon products and mixed material products. tempered glass cover with silicon flinge