IPU1011 Features: * Precision Machined Blocks * Hard surface tension * Perfect flat sanding surfaces * Flexible * PatentedThis block is designed to follow slightly curved or flat panels without digging into fill material. Size: 1-3/8" x 2-5/8" x 5-1/2". * 1/3 Dura-Block 5-1/4"" Sanding Block Warranty: * Lifetime warranty does not cover abuse