PLUG FOR KUNG FU GRIP The people have spoken, and Die Free Co listened. Their storage PLUG accepts two CR123, AA, or AAA batteries. It also has a slot for a single CR2032 battery, a pocket for a small Allen or Torx wrench, and a slot for a MultiTasker NANO Tool. Got meaty hands? They've got you covered. In addition to the storage, the PLUG also extends the length of the grip .25" and squares off the back of the grip to fill your palm. SPECS AND FEATURES Made in USA Compatibility: Kung Fu Grip Height: 1.5" Weight: .7 oz Retention: Friction Material: Durable Rubber Water Drainage Holes on the Bottom Skittles Co Mfg: Die Free Co