ProductsHome / Concrete Hollow Blocks (CHB) / 4″ (90mm) 4″ (90mm) Category: Concrete Hollow Blocks (CHB) Description Thickness: 4″ (90mm) Compressive Strength (psi): 700, 1000, 1200 Length: 390 mm Height: 190 mm Area: 0.0741 m2 Related products 6″ Corner Block Read more 3″ (68mm) Read more 5″ (115mm) Read more