TriggerPoint Performance Mobility Kit with GRID Foam Roller, MB1 Massage Ball, and GRID Strap $37.15 Make sure this fits by entering your model number. Trigger Point self-massage tool kit includes the original GRID Foam Roller with GRID Strap, and an MB1 Massage Ball Patented foam roller design offers a multi-density exterior constructed over a rigid, hollow core for rolling through tight muscles and knots to reduce soreness and improve mobility