Roylan Temper Foam R-Lite Foam Blocks. Green=Firm resistance level. Blocks measure 1¾" x 1 ¾" x 3". Temper Foam R-Lite Foam Blocks are used to increase hand and finger strength in personal or professional environments. This block is constructed of slow-recovery foam, and determines exercise rate by its recovery time. Blocks are made to be used at home, on-the-go and in clinical settings. These hand exercise blocks are ideal for people with arthritis or to rebuild strength in your hand and/or fingers after an injury or post-surgery. UOM: 32/PK.