This is a simple, no-fuss option for a navigational aid for underwater exploration or a reel for DSMB deployment. It is available in three lengths, with each spool made of a different material. The 15-meter line comes with a Delrin spool. The 20-meter line spool is made of ABS plastic with an integrated low-profile line marker lock. The 30-meter version is made of reinforced nylon.

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