BRIGHTEN NARROW SPACES BEAUTIFULLY: The rectangular 4x8 design allows more layout flexibility, bringing soft, diffused daylight into bathrooms, windows, and partitions while maintaining moderate privacy. SLIM PROFILE, STRONG IMPACT: Ideal for creative layouts, borders, and accents thanks to its compact size and classic Nubio wave pattern that enhances visual movement. ENGINEERED FOR PERFORMANCE: Offers 75% light transmission, a 45-minute fire rating, and dependable thermal resistance for both residential and commercial builds. RELIABLE INSTALLATION QUALITY: Features a white edge coating that improves mortar adhesion and ensures durable structural integration into glass block walls. CRITICAL USE NOTE: Actual size 3-3/4" × 7-3/4" × 3-1/8". No pre-drilled holes. Not intended for crafting; for architectural use only. The Seves Glass Block 4x8x3 Nubio Glass Block brings elegance and versatility to architectural designs. Its classic wave pattern softly disperses light, offering moderate privacy with a bright, inviting ambiance—ideal for narrow windows, shower walls, sidelights, or accent rows. The slim rectangular format enables creative layouts that complement both modern and traditional spaces. Engineered for long-term performance, this glass block features a 45-minute fire rating, strong thermal efficiency, and an STC rating that supports quieter interiors. With 75% visible light transmission, it enhances natural illumination while reducing glare and maintaining obscurity where needed. A white bond coating ensures improved adhesion during installation, delivering a stable and lasting fit within mortar-set systems. This unit does not contain pre-drilled holes and is not designed for crafting. Its actual dimensions of 3-3/4" × 7-3/4" × 3-1/8" ensure compatibility with most standard glass block installation frameworks.