Injection-moulded from ABS plastic — the same family of materials used in LEGO bricks. ABS does not warp, holds its shape over time, and bonds reliably with superglue (cyanoacrylate) and two-part epoxy. The textured top surface grips PVA, texture paste, and basing sand without needing to score or rough up the surface first. Takes all spray and brush-on primers cleanly.

Every mould in the OBS range is designed in-house using industry-standard CAD — these are not generic imports. We control the full production chain from design through to quality control. Mould lines are clean and consistent.

The diagonal slot is a deliberate design choice — running corner to corner gives 18mm of usable slot length in a 20mm base, which is longer than a parallel slot could achieve on the same footprint. This accommodates wider-tabbed models that would otherwise not fit a parallel 20mm slot. 2.6mm of underside clearance fits 3x2mm disc magnets for magnetic tray use.

20mm square is the standard rank-and-file infantry base for mass-battle wargaming. The slotted version is designed for models with integrated tabs on their feet. The diagonal slot orientation allows wider tabs to fit than a parallel slot on the same 20mm base.

The 20mm outer width matches industry-standard nominal sizing. These bases rank up edge-to-edge and fit standard 20mm square movement trays. OBS square-to-round converters are available if you need to switch between game systems.

Part of the Open Basing System (OBS)

One Ecosystem · Every Size · Every Shape

OBS is a modular basing ecosystem designed as a whole — not a random collection of bestsellers. Every size, shape, converter, and tray is planned to work together. Independent and gamer-built.

New products added regularly — the OBS range is always growing.

The slot runs corner to corner. Position the model's tab at the angle you want the figure to face — the diagonal gives you flexibility on orientation that a straight slot doesn't. Apply superglue from underneath and trim any excess tab flush.

Fill it with green stuff, milliput, or a strip of plasticard cut to width before texturing. The diagonal is slightly harder to fill neatly than a straight slot — milliput pressed in and scraped flush works well.

Keep texture materials away from edges so bases rank up flush. Batch-prime on a strip of tape for efficiency when doing a full regiment. A uniform rim colour gives your ranked block a clean, cohesive appearance.

2.6mm underside clearance fits 3x2mm disc magnets. Magnetising a regiment makes movement trays effortless — pick up and move entire blocks at once. CA gel, check polarity consistently across the whole unit.