It is a genuine OEM supplied component which is made for Makita and Delta equipment. This is the bumper for the part #B-60109 trimmer head assembly. It is a high-quality part which is made of durable plastic and is sold individually, keep in mind it is the bumper only. It provides an identical replacement for a missing or a faulty component that was included with a new unit.
NOTE: the complete trimmer head assembly is sold separately and is available here #B-60109 Trimmer Head.