Quartz valve/topper spheres. Superior to borosilicate in every way, these JGS2 ultra pure quartz spheres are ground to extreme precision.
Improved insulation for handles, excellent shock resistance (can clean with solvent without removing), excellent durability and wear resistance.
10mm - micro slurper valve and spinner for blenders
12mm - regular slurper valve and spinner for blenders
22mm - blender/slurper top