Hollow Acrylic Semi-Circle for Refraction Index Study, 3 x 1.5 x 1.75" Health & Genetics_Equipment & Supplies Short 150mm red 2mm-stackable lead

Short 150mm red 2mm-stackable lead with nickel-plated pins on both ends

Three-part medical-quality human skull model with a removable calvarium and articulated mandible

Cross wires set inside a 10mm aperture on a 75mm circular black metal screen

Extending up to 65 feet from a 20cm closed height on the included wooden stand

5 inch base

Hollow Acrylic Semi-Circle for Refraction Index Study, 3 x 1.5 x 1.75" Health & Genetics_Equipment & Supplies Short 150mm red 2mm-stackable leadAcrylic semi circular block measuring 3 x 1. 5 x 1. 75 inches with a center indicator line, used to study Snell's law, total internal reflection, and critical angle behavior.