These chalk line reels feature a slotted, self sealing rubber grommet for easy filling. Spun polyester line is 100' long and has a hook ring. The line has the tough strength of nylon and the chalk holding capacity of cotton. Both models have positive line locking mechanisms. The No. GB-1 has self lubricating nylon gears that allow rewinding 3 to 4 times faster than regular reels. Simple finger pressure applied to the handle permits free wheeling of the line going out without the handle turning. Nonbreakable plastic case.