100% natural rubber on both sides-NO STICKY GLUE OR NAILS. Unique texture holds furniture in place on hard floors * Made in USA - U.S. Patent Pending - rubber is untreated and completely safe for all hard floors * Set includes: (8) 4" square pads at 1/2" thick. Set comes with 8 pads total. Heavy duty even for the heaviest of furniture * DURA-GRIP® truly stops beds, sectionals, sofas, couches, tables, chairs or any other furniture from moving and sliding * DURA-GRIP® is rated as best floor protector to prevent damage from furniture