Igishushanyo gishya cyamabara yikirahuri umunwa wakozwe mubirahuri bya borosiliate.Nibishushanyo bidasanzwe hamwe na kristaline idasanzwe.Bihuye neza mumaboko, birashimishije kandi byiza kubera imiterere nuburemere.Birashobora guhuzwa hamwe na silicone isanzwe hamwe ninama za plastike.