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.

At 150×100mm this is the largest base in the entire OBS range — over twice the footprint of a 100mm square. The internal grid of reinforcement ribs and the low ~4mm profile keep it rigid and flat even under the heaviest resin titans and multi-part war engines. The 1.53mm floor is deliberately thin to keep overall weight down, while the rib structure handles the rigidity. 2.5mm of underside clearance fits 3×2mm disc magnets — use six or more spread in a grid pattern for a balanced, secure hold in transport. Be aware of rib positions when placing magnets — seat them between ribs for a flush fit.

150×100mm rectangle is a titan and colossal model footprint — the largest rectangular base specification in mass-battle wargaming. Used for the most imposing models in any collection: siege towers, colossal monsters, titan-class war engines, and display-centrepiece builds.

The 149.51×99.02mm outer dimensions sit fractionally under the 150×100mm nominal, providing clearance for ranked placement. Pairs with 100mm squares, 100×50mm and 100×60mm rectangles, and smaller infantry and cavalry bases in the same formation 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.

Wash before priming — a quick rinse in warm soapy water removes mould release residue. Let it dry completely flat to avoid water pooling — at this size, trapped moisture under the primer will cause problems.

At 150×100mm you're mounting the heaviest models in the hobby — multi-kilogram resin titans, siege towers, colossal creatures. Pin every contact point with 1mm+ brass rod and two-part epoxy. Use multi-point pinning across the full footprint for weight distribution. For kits with small contact points, build structural scenic elements and pin through those as hidden supports — at this weight class, visible pins through scenery are better than a model that falls off.

150 cm² — this is a full diorama. Plan the composition before committing: mock up the model, sketch terrain placement, think about the narrative the base tells. Build elevation with cork and bark, layer environmental detail, create depth and visual flow that draws the eye toward the model. Consider how the base sits alongside smaller ranked units in formation — the scale contrast is part of the drama.

2.5mm underside clearance fits 3×2mm disc magnets. At this footprint, use six or more spread in a grid pattern — essential for heavy models in transport. Be aware of the reinforcement ribs on the underside — seat magnets between ribs for a flush fit. CA gel, check polarity before it sets. For the heaviest resin kits, consider supplementing magnets with a foam-lined transport case shaped to the model.