These are excellent DOUBLE-CHAMBER wands. Each wand has 2 separate chambers winding down around the other - double helix! These are great for kaleidoscopes or just to have around to enjoy the flowing beads inside. The large wands (top picture) are 18 x 220mm (about 9 inches long), the small wands (bottom picture) are 15 x 130mm (about 5 1/4 inches long). Click pictures for larger images.