Telescopic sliding pencil boxes' core advantages lie in their scientifically reasonable parameter design. Each parameter has been accurately measured and optimized, balancing telescopic smoothness, storage capacity and ease of use, adapting to the stationery storage needs of different groups such as students and office workers. With standardized parameter configuration, they have become practical and convenient stationery storage items. Their parameters cover various dimensions such as size specifications, material parameters, telescopic structure parameters and detailed parameters. The parameters are accurately and standardized marked, without redundant information, comprehensively presenting the core configuration of the product, allowing users to clearly understand the product performance and applicable scenarios, highlighting the professionalism and practicality of the product.

　　Size parameters are the core foundation. Adopting a telescopic design, the parameters are divided into contracted state and extended state, accurately adapting to different storage needs and usage scenarios. In the contracted state, it is 18cm in length × 7cm in width × 2.5cm in height, small and thin, easy to put into the side pocket of the schoolbag or the desk drawer, without occupying too much space; in the extended state, the length can be extended to 32cm, the width remains 7cm, and the height is 2.5cm, doubling the storage space, which can easily hold various stationery such as pencils, pens, erasers, rulers and compasses, meeting the storage needs of daily study and office work. The overall thickness of the box body is uniform, with an error controlled within 0.1cm, and the edge flatness is high, ensuring smooth telescoping without jamming, while taking into account the comfort of holding.

　　Material parameters balance durability and safety. The shell is made of food-grade ABS material, with a thickness of 0.3cm and a density of 1.05g/cm³, which is tough and impact-resistant, not easy to be damaged or deformed, can withstand daily collisions and extrusions, and remains intact after long-term use. The inner wall is made of environmentally friendly PP material, with a thickness of 0.2cm, no odor and no harmful residues, meeting the stationery safety standards, avoiding pollution after contact with stationery, and the inner wall is smooth and delicate, not scratching the surface of the stationery. The telescopic slide rail is made of stainless steel, with a diameter of 0.8cm and a hardness of HRC20-25, rust-proof and corrosion-resistant, ensuring smooth telescoping, not easy to jam or rust after long-term use.

　　Telescopic structure parameters highlight convenience. Adopting a two-way telescopic slide rail design, the telescopic stroke is 14cm, the telescopic damping is moderate, the force is uniform, and smooth telescoping can be achieved without much effort. At the same time, it has a positioning function, which can be stably fixed at any extended position to avoid accidental contraction during use. The slide rail spacing is 3cm, symmetrically distributed, ensuring stable telescoping without tilting or jamming, and the service life can reach more than 10,000 times. After the box body is closed, the gap is less than 0.05cm, with good sealing performance, which can effectively prevent stationery from falling and dust from entering, protecting the stationery from being clean.

　　Detailed parameters balance practicality and comfort. The box body is equipped with invisible buckles, which can bear a force of ≥5N, close tightly and open smoothly, preventing stationery from falling during telescoping; the box is equipped with partitioned storage slots, with a slot width of 2cm and a depth of 2cm, which can classify and store different types of stationery, improving the storage regularity. The box body weighs 120g, with a lightweight design, easy to carry without a sense of weight; the surface adopts a frosted process, with a friction coefficient of 0.3, a delicate hand feel, not easy to slip, and at the same time has the characteristics of scratch resistance and easy cleaning. Stains can be removed by daily wiping, and it remains clean after long-term use.