Feature: 1. Intelligent Development: Metal locking puzzle toy can promote intellectual development, improve your fingers flexibility and relax your mind. 2. Multifunction: Metal brain teaser puzzles help to develop the brain in an all round way, improves the way of thinking, and adjust the state of mind. 3. Package Included: A total of 16pcs of metal interlock puzzle toy, with different shapes, which is suitable for the kids and the elderly play. 4. Brain Development: Metal locking puzzle toy looks pretty simple, but it contains a lot of puzzle solving technique, which is a great brain teaser toy. 5. Stainless Steel: Interlocking puzzle toy made of stainless steel material, safe and sturdy, with smoothing surfaces to prevent hurting your hands. Specification: Item Type: Puzzle Lock Set Material: Metal, Stainless Steel Purpose: 16pcs set of metal puzzle lock Size: Approx. Type 1: 4.5 x 4.7cm / 1.8 x 1.9in Type 2: 4.2 x 4.2cm / 1.7 x 1.7in Type 3: 6 x 4.1cm / 2.4 x 1.6in Type 4: 4.5 x 4.3cm / 1.8 x 1.7in Type 5: 6.9 x 4.7cm / 2.7 x 1.9in Type 6: 5.6 x 6.5cm / 2.2 x 2.6in Type 7: 6.9 x 4.2cm / 2.7 x 1.7in Type 8: 4.3 x 4.9cm / 1.7 x 1.9in Type 9: 3.4 x 3.7cm / 1.3 x 1.5in Type 10: 5.5 x 4.9cm / 2.2 x 1.9in Type 11: 5.2 x 4.2cm / 2 x 1.7in Type 12: 3.5 x 4.2cm / 1.4 x 1.7in Type 13: 4 x 4cm / 1.6 x 1.6in Type 14: 4 x 4.5cm / 1.6 x 1.8in Type 15: 8.4 x 3.2cm / 3.3 x 1.3in Type 16: 5.1 x 4.2cm / 2 x 1.7in 3C Configuration Category: Metal toys suitable for kids under 14 years old. Package List: 16 x Metal Locking Puzzles