Product Description Hollow-core fiberglass handle provides better balance and absorbs shock more effectively than solid fiberglass. Head sure-lock wedged and epoxy sealed. Slip resistant grip, contoured for comfort. From the Manufacturer FS999 Straight Claw Hammer has a patented hollow core fiberglass handle that absorbs shock and provides superb balance. Head "Sure-Lock" wedged and epoxy sealed. Slip resistant grip, contoured for comfort.