Bark and wood extracts used for tanning leather. Marketing European chestnuts, which are larger but less sweet than the American chestnut, are marketed in-shell for roasting. Chinese chestnuts are smaller and less sweet than the American chestnut but sweeter than the European chestnut. Japanese chestnuts are a variable product with some trees producing huge nuts up tocm in diameter and weighing 30 g or more while others bear smaller nuts; their nuts are also less sweet than those from the Chinese chestnut.