Shop our selection of glycerin and freezable nectar collectors, or dab straws. These innovative dabbing devices are typically made of glass, and feature glycerin inside the chamber of the nectar collector. This glycerin will cool down the smoke that passes through it allowing for a much colder and smoother hit then usual. These dab straws are also freezable, as you can place them in the freezer for up to 12 hours, keeping them cold for up to 18 more hours!