You are buying 20 (TWENTY) NEW NOMINAL 3/4" x 3/4" x 3/4" SQUARE TRANSLUCENT RED EXTRUDED ACRYLIC ROD CUBES. (3/4 Inch x 3/4 Inch x 3/4 Inch Square) (Approx. 19.05 mm Square) I cut these cubes from 3/4" square acrylic rods. Because they are cut from rods, 2 sides of each cube is saw cut. Only 4 Sides are polished. The 2 cut sides look somewhat frosted and are not polished. PLEASE view all the pictures before purchasing. In normal light conditions the cubes are vibrant red. As seen on the black grid, the cubes are translucent. SQUARE ACRYLIC ROD FACTS YOU SHOULD KNOW BEFORE BUYING (1.) THE SQUARE SIZE DIMENSION STATED IS NOMINAL. i.e.: A SQUARE NOMINAL SIZE OF 1” X 1” ROD CUBE IS TYPICALLY 31/32” X 31/32”. (2.) THE 4 CLEAR SIDES OF CUBES TEND TO BE SLIGHTLY CONCAVE or CONVEX. THEY ARE RARELY ALWAYS PERFECTLY FLAT. THAT IS THE NATURE OF EXTRUDED ACRYLIC SQUARE RODS. The cubes will ONLY sit perfectly flat on the saw cut sides of the cube. These cubes are AQUARIUM and FISH TANK SAFE! To assure that you get the finest quality, a protective sleeve is kept in place on the rod while being cut into cubes to protect the acrylic. The protective sleeve shreds during the cut so the cubes are then placed in a resealable zip lock bag. All cubes have saw cut edges on two ends. Saw cutting causes micro chips on the saw cut ends of the cubes as seen in the pictures. The saw cut edges are NOT polished. Please allow a length tolerance of +/- 1/32" on all pieces.