Cook Pro 680 3-Cup Coffee Plunger This plunger is constructed with heat resistant borosilicate glass, low coefficients of thermal expansion and resistant to thermal shock The plunger comes with newly improved stainless steel film-like strainer mmt 3 - micro mesh technology and heat resistant silicone rim around the strainer This new designed strainer will produce coffee without particles and it will last longer Coffee plunger produces an exceptionally full-bodied flavor coffee, far superior to the traditional drip or perk method