Mack Bottom Insulator Pad, PU material, high quality, hard package, competitive price. USA, Canada, Central America market Mack Bottom Insulator Pad1. Material: PU2. Suited Market: USA, CANADA, CENTER AMERICAN market3. Part No: 10QK48/325-1254. Description: Thickness: 3-3/4" Width: 6" Length: 6" Dowel: 1 3/4" Durometer: 70