SME Self-Healing Bouncing Ball 4 Polymer SBB. This 4" SME Self-Healing Bouncing Ball is made out of a special polymer that is supposed to be self-healing and pretty tough. Whenever you smack this target a small explosion usually occurs along with a small shockwave through the air that bounces the ball back up to the shooter's target. The shockwave then travels through the air and rebounds back to the shooter. The SME Self-Healing Bouncing Ball is a fun and challenging target to shoot and is a good training tool. The SME Self-Healing Bouncing Ball is a great training aid for those who have a bit of a crazed shooter in the family. You never know when you're going to find that nemesis lurking in the corner Specifications for SME Self-Healing Bouncing Ball 4" Polymer SBB: Manufacturer: SME Fabric/Material: Polymer Quantity: 1 Condition: Factory DEMO Size: 4 in Package Contents: SME Self-Healing Bouncing Ball 4" Polymer SBB The SME Self-Healing Bouncing Ball 4" Polymer SBB is a quality addition to the SME lineup. For more great deals on Targets by SME please browse our SME Shooting Accessories page. SME Self-Healing Bouncing Ball 4 Polymer SBB