The B-series exists in two standards. Japanese makers (Kokuyo, Midori, Apica) use JIS — a touch taller and narrower. European makers (Leuchtturm1917, Rhodia) use ISO. A-sizes (A4, A5, A6) are identical worldwide, so they get a single entry each.
Slim is not a formal standard — it's a maker's narrower cut. B6 Slim is well-established but differs by brand (Midori ≈110×176, Stalogy 100×180). B5 Slim is rare and its width drifts, so treat that figure as approximate.
Specs (brand, size, gsm, pages) are verified. Links use your detected region (change it above): Amazon for the live listing, price and star rating, and Camel for price history where that marketplace is supported (Camel covers the US, UK, Canada, Germany, France, Italy, Spain, Japan and Australia; the Camel link is hidden elsewhere).
Several products use a house size close to — but not exactly — the standard: Leuchtturm's Pocket runs 90×150 (under A6), its B6+ is 125×190 (taller than B6), its Composition is 178×254 (between ISO and JIS B5). Real dimensions are shown per product.