diff --git a/nodes.lua b/nodes.lua
index 01f9553..ef10f43 100644
--- a/nodes.lua
+++ b/nodes.lua
@@ -6,14 +6,16 @@ minetest.register_node("basic_materials:cement_block", {
 	description = S("Cement"),
 	tiles = {"basic_materials_cement_block.png"},
 	is_ground_content = true,
-	groups = {cracky=2, dig_stone = 1},
+	groups = {cracky=2, dig_stone = 1, pickaxey=5},
+	_mcl_hardness=1.6,
 	sounds = sound_api.node_sound_stone_defaults(),
 })
 
 minetest.register_node("basic_materials:concrete_block", {
 	description = S("Concrete Block"),
 	tiles = {"basic_materials_concrete_block.png",},
-	groups = {cracky=1, concrete=1, dig_stone = 1},
+	groups = {cracky=1, concrete=1, dig_stone = 1, pickaxey=5},
+	_mcl_hardness=1.6,
 	sounds = sound_api.node_sound_stone_defaults(),
 })
 
@@ -27,7 +29,8 @@ minetest.register_node("basic_materials:chain_steel", {
 	sunlight_propagates = true,
 	paramtype = "light",
 	inventory_image = "basic_materials_chain_steel_inv.png",
-	groups = {cracky=3, dig_stone = 1},
+	groups = {cracky=3, dig_stone = 1, pickaxey=5},
+	_mcl_hardness=1.6,
 	selection_box = chains_sbox,
 })
 
@@ -41,7 +44,8 @@ minetest.register_node("basic_materials:chain_brass", {
 	sunlight_propagates = true,
 	paramtype = "light",
 	inventory_image = "basic_materials_chain_brass_inv.png",
-	groups = {cracky=3, dig_stone = 1},
+	groups = {cracky=3, dig_stone = 1, pickaxey=5},
+	_mcl_hardness=1.6,
 	selection_box = chains_sbox,
 })
 
@@ -49,6 +53,7 @@ minetest.register_node("basic_materials:brass_block", {
 	description = S("Brass Block"),
 	tiles = { "basic_materials_brass_block.png" },
 	is_ground_content = false,
-	groups = {cracky=1, dig_stone = 1},
+	groups = {cracky=1, dig_stone = 1, pickaxey=5},
+	_mcl_hardness=1.6,
 	sounds = sound_api.node_sound_metal_defaults()
 })