Glassware
Luxtea Vintage Glass Coffee Mugs Set of 2 Ribbed Drinking Glasses Clear Tea Cups Borosilicate Glass Cup in Vertical Stripes Pattern for Cappuccino,Latte,Beverage (14 Fl.Oz.,Yellow Handle)
Those glass mugs set of 2 are made of borosilicate glass which is thin and light weigh than ordinary glass yet strong enough to withstand extream high temperature to 300 ℉ and low temperature to -5 ℉. The mugs are safe to be Microwaved or Freezed....
https://www.bizrate.co.uk/glassware/luxtea-vintage-glass-coffee-mugs-oid37210859839.html