How to Make Reels Go Viral on Instagram Kelsey in London Artec Block Perfect Mass Set. Artec Block Perfect Mass Set Have fun making and learning math! 280 pieces with textbook Package size: 216 x 242 x 213 mm [Basic Squares] Red, blue, water, yellow, light green x 24 each, pale orange, light gray, brown, white, black x 8 each [Half B] Red, blue, water, yellow, light green, pale orange, light gray, brown, white, black x 4 each [Triangle A] Red, blue, water, yellow, light green, pale orange, light gray, brown, white, black x 8 each ABS