professional hardware (brush hoods) with heatsinks, made from hard aluminium plate with thickness of 0.4mm (.0157"), gold plated, hand work, most precise, no more grinding or drilling, when fitted onto an endbell perfectly ensure that brushes are precisely centered to the armature axis and also brush clearance is the smallest possible in these hardware, weigh only 0,6 grammes, these brush hoods dissipates 50% more heat away than #266, packaged 6 pairs per bag