Slotted Masses Set- Zinc Casted 20gm.-EIS-PHZNW020 offers a thoughtfully designed, durable resource for hands-on learning. 20 gram slotted weight. Accuracy ±2% Zinc die casted, powder coated Spare or extra part for Slotted Masses Sets Excellent alternate for expensive brass weights. Great tool for physics experiments 20 gram slotted weight. Zinc die casted, powder coated. Perfect alternative to expensive brass weights. Excellent tool for physics experiments. Single slotted weight. Ideal as spare or extra part to full slotted weight sets. Accuracy ±2%. Weight measures just over 1" in diameter. Slot space measures 0.125".