GlassLab 303 10" Fixed Downstem Beaker w/ Color Lip - Color Mix Overview. Where Art Meets Science. Based in Denver, Colorado, GlassLab303 specializes in high-quality scientific glass with an artistic twist. From beakers to bangers, this glass lineup stands out. Each piece is marked with a "Colorado Certified" logo by GlassLab303 to ensure the best quality control. The experienced in-house design team handpicks the raw materials and American color rods for all of their products. Features & specs. 10" tall Fixed downstem Beaker w/ color lip Made with American color rods Selling points. Colorado-certified and marked with a logo Company values artistic design and integrity Quality and cost-effective What's in the box. 1x GlassLab 303 10" Fixed Downstem Beaker w/ Color Lip - Color Mix