Tillman 552 Aluminized/Vermiculite Triple Layer Back-Hand Pad 7.5 X 5.5 on July 20, 2026 July 20, 2026 The top layer is aluminized carbon Kevlar (ACK). The middle and bottom layers are vermiculite coated fiberglass. Middle and bottom layers: vermiculite coated fiberglass. Manufacturer: Tillman. Manufacturer Part Number: 552.