Specifications: Material: ABS Internal Contacts Material: Phosphor bronze finished. Board Base: Self-Adhesive Tape 830 tie points total: One terminal strip: 630 jacks,Two distribution strips: 200 jacks Socket Pitch: 2.54mm / 0.1" Matching jumper, diameter 0.8mm Contact Type: Double leaf copper spring Extension Clips: Yes (Can extend with other boards) Dimension: 16.5x5.6x0.85 (cm)/6.5x2.1x0.3 (in) Weight:89g/pcs Features: Recyclable, environmentally friendly recycling The structure is clear and easy to use The breadboard can be assembled in fixed units Package included: 830 tie-points breadboard