TOMUM Set of 6pcs CY-25D Bolt Type 1" Nylon Ball Transfer Bearing Unit Table Conveyor Roller Ball with Bolt for Transmission, Furniture, Wheelchair: Amazon.com: Industrial & Scientific
Body Bolt Vibrating Foam Roller – Electric Foam Back Roller with 4 speeds for Recovery – Deep Tissue, Trigger Point Sports Massage Therapy – High Intensity Muscle Roller : Amazon.co.uk: Sports & Outdoors
Amazon.com: FASNA ZL204-DRS Bolt Type Roller Bearing,Single Row,Seal, 20 mm x 52 mm x 30.7 mm, 1 Piece (Size : ZL204-DRS) : Industrial & Scientific