Cando Foam Roller - Black Composite - Extra Firm - 6 X 12 - Half-round. * Molded Composite Foam Rollers Are Perfect For Positioning Balance Postural And Muscle Re-education Spinal Stabilization Body Awareness And Coordination And Ranging And Strengthening Activities. * Round Rollers Offer Progressive Exercise Sequences - User Can Graduate From An Easier (smaller Diameter) To A More Difficult (larger Diameter) Roller. * Half Round Roller Is A Great Tool For Ankle Stretching And Knee Rehabilitation. * Diameter Refers To The Width Of The Half-round Profile. * The Molded Rollers Are Strong Enough To Be Used By Large Adults And Active Children. * Foam Rollers Are Available In 36 18 And 12 Lengths With Either A Round (circular) Or Half-round (semi-circular) Profile. * This Line Of Rollers Is Available In Black. * The Molded Composite Foam Rollers Are More Firm Than The Polyethylene Roller And Are Rugged. * Dimensions: 3 X 6 X 12 . * Weight: 1 Lb.