Water , cocktail , etc. glass 36cl , Η8,9 χ Φ8,5 , Tempered technology 5 times stronger .
Tempered glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. Tempering creates imbalanced internal stresses which cause the glass, when broken, to crumble into small granular chunks instead of splintering into jagged shards. The granular chunks are less likely to cause injury.