Density Rod Set OF 12

Density Rods Set, Different Material containing 12 rods of different material with different length but same in diameter, 12.5mm. All density rods are placed in a square, drilled wooden block. This set of density rods containing: Copper Rod, Brass Rod, Acetyl Rod, Rubber Rod, Acrylic Rod, Aluminum Rod, Polypropylene Rod, PVC Rod, Nylon Rod, Oak Rod, Maple Rod, Walnut Rod. All rods are varying in length from 38mm minimum to 60mm maximum