The MFJS MeiLong 13x13 is a big cube, If you're looking to expand your collection, or just for a new challenge, give this one a shot. The Anti-stick Degin can prevent the cube viscosity,make the cube solve smoothlt.Optimized parts of the round corner pieces,makes work coordinate effectively.enhance the corner cutting ability,make it more smooth when it solves. The traditional stickers have been replaced with original and eco-friendly ABS material, which mean no fading, peeling or cheating! This is a Frosted Surface Cube.Feels more texture and avoid the scratches after the long-time using. The elasticity of the cube can be adjusted, and the built-in elasticity adjustment system can be adjusted with a screwdriver according to your own preferences to meet different needs and give us more control. Solving puzzles and brain teasers are important activities to teach kids to work hard at solving complex problems and foster your kid's sense of space and enhance a child's memory.Whether you're trying to stretch your brain capacity or spending some leisure time with your loved ones, this would be a great gift for your kids.