The magnetic ball set is a fun toy with magnetic ability to create hundreds of geometric patterns to improve children's intelligence, imagination and creativity. Or it can be used for adults to relieve stress. Specifications: Material: NdFeB Quantity: 216pcs (3mm), 216Pcs( 5mm), 1000Pcs(5mm) (optional) Color: Silver Mix color: 216pcs (3mm): 6 colors 216 pieces (5 mm): 6 colors/8 colors 1000 pieces (5 mm): 10 colors (optional) Package weight: 216 pieces (3 mm): 67 g / 2.36 ounces ; 216 pieces (5 mm): 144 g / 5.08 ounces ; 1000 pieces (5 mm): 565 g / 19.93 ounces Package size: 216 pieces (3mm/5mm): 65 * 40 * 40mm / 2.56 * 1.57 * 1.57in 1000pcs (5mm): 85 * 60 * 60mm / 3.35 * 2.36 * 2.36in