The Custom Polished Black Marble Stepped Desk Tabletop Slab (model CST-BM-2490, unbranded) is a custom natural stone furniture component designed for premium desk installations. Visually, the solid slab features polished natural black marble with flowing white bookmatched veining, aligned to create a continuous symmetrical pattern across its full width. Its stepped layout includes a central 600mm wide front knee notch, 200mm deep stepped extensions on both left and right ends, and a 700mm deep main work surface between the extensions, delivering a structured, executive-ready silhouette. Edges are finished with a 2mm micro-chamfer, softening the 36mm full-thickness profile while eliminating sharp corners to reduce injury risk and edge chipping. Constructed from homogeneous solid natural marble with no veneer or composite core, the slab is CNC waterjet cut to its precise stepped profile. Natural fissures are resin-filled for structural integrity, and the top surface receives a multi-pass polished mirror high-gloss finish, treated post-polishing with a penetrating resin sealer for moderate stain protection. The slab’s flatness holds a 0.5mm per linear meter tolerance, with a Mohs hardness rating of 3 for scratch resistance and 120°C surface heat resistance. It supports a 150kg distributed static load, with a recommended support point spacing of 600mm for stable installation. Optional pre-drilled threaded metal inserts on the underside enable secure attachment to metal or wood desk bases, accommodating M6 to M10 connectors with at least two fixing points at major joints. Routine care requires only pH-neutral stone cleaners, with no specialized tools needed for regular maintenance. This tabletop serves as a premium flat work surface compatible with monitors, keyboards, and standard office accessories, suited for high-end executive desks in private offices, luxury home study desks in upscale residential interiors, custom stone-top desk production for furniture makers, and display desk surfaces in premium showrooms or gallery spaces. It may also be paired with matching stone side cabinets or reception surfaces for fully coordinated interior schemes. For procurement, note the slab’s 190kg unpackaged net weight; units ship as one set across two cartons, with 0.8 cubic meters of packaging volume per set, 40 minutes of assembly time, and high-density foam padding on all exposed corners for transit protection. Six recommended finish options are available to align with specific project design requirements.