From the Manufacturer
The Zip sanding sponge holder is the perfect tool for use with standard 3-Inch by 5-Inch sanding sponges. The comfortable grip helps to relieve hand fatigue. The unique design also helps to keep your knuckles out of the way
Gator Zip 4 Pack Sanding Sponge Holder Assorted Grit Kit. Everything you need to start sanding is included in this package. The kit contains the Gator Zip sponge holder and 4 sanding sponges of assorted grit. The sponge holder will hold any 3" x 5" sanding sponge. The design of the sponge holder gives you maximum comfort when holding the handle and keeps your fingers away from the surfaced while sanding.