In the early days of diving, commercially made spools were not available, so divers made their own ... using anything from tape spools, to electrical wire spools. With the SubGravity RES (ridiculously enhanced spool), gone are the days of making due with a spool that is 'jUst As gOoD'. The SubGravity RES is made from POM because of its durability, buoyancy characteristics and well proven track record in harsh diving conditions. Just what else make the RES the best spool available? Sometimes it's the small things that make the biggest difference: Designed for long lasting ease of use 8 color options, 3 size options Offset holes on each side ensure that divers can easily clip their double ender with the perfect amount of tension Octagonal center to prevent line slippage Optimized texture to facilitate ease of use Center hole designed to accomodate the SubGravity FSI (free-spinning spool insert - COMING SOON!) Loaded with braided #24 nylon line in your choice of color Properly attached and measured line Shrink wrapped knots to prevent tangling