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RBT Units share common designations in the Pro-Line product group:
Standard Density (SD): Balls are arranged in a 6" x 6" Ball Pattern
High Density (HD): Balls are arranged in a 3" x 6" Ball Pattern
Half Coverage (HC): Only one half of the RBT work surface is allocated retracting balls
Full Coverage (FC): The entire RBT work surface is populated with balls
Please review the diagrams below: | 
