The Gel Blaster Water Beads Pellets Bullets - Standard - 10,000 - Mix is a bag of 10,000 gel balls for use with gel blasters.  These gel balls are typically made of a super absorbent polymer (SAP) that absorbs water and expands into a ball. They are designed to break on impact and are not considered harmful. Gel blasters are popular for target shooting and backyard skirmishes.