Furniture risers can be used to elevate a couch or bed for easier standing and sitting. Risers are made of heavy-duty plastic; reinforced with ribbed construction. Non-skid pads protect furniture and flooring. Set includes four 3" (7.6cm) risers and four 4" (10cm) risers that may be used alone or stacked for a total raised height of 5" (13cm). A deep cavity with a padded insert ensures a secure fit. Risers accommodate furniture legs that measure up to 2-1/2" (6.4cm) in diameter. Weight capacity is 350 lbs. (159kg).