OEM chainsaw bar from Stihl. Stihl Rollomatic E Super chainsaws bars (also known as ES bars) are the premium sprocket nose chainsaw bars available from Stihl. Bars are made machined from a single piece of rigid steel. The replaceable sprocket nose tip is securely fastened by three rivets. The nose sprocket is sealed to keep dirt and corrosive material out, therefore never needs to be greased.