LARGE DOOR STOPPERS - Each door stopper measures 4.5" (L) X 2.05" (W) X 1.2" (H) and fits any door with clearance up to 1.2". Unlike most door stoppers found at hardware stores, these stoppers are BIGGER and STRONGER, designed to securely wedge even the heaviest doors. MULTI SURFACE DOOR STOP - Whether it is tile, concrete or wooden floor, these door wedges will stop your door from moving. They are best suited for institutional and office use though they can fit perfectly at home as well. NON-MARKING, ANTI-SLIP WEDGE - Protect your home or office floors with these abrasion-resistant stoppers which won't slip or scratch even on those heavy duty Industrial doors.These wedges are made of quality certified rubber and are safe to use. ANTI SLIP BASE KEEPS THEM IN PLACE - And also provides ultimate gripping power. With their unique hollow design, they wedge doors like no other. They have additional skirting around them to make them even more unlikely to flip over or move should a strong wind come racing through your home. LIFETIME 100% MONEY BACK GUARANTEE - We're so confident that you'll love the Yingrui door stopper that we'll refund every penny if you don't like it Actually, most customers like it so much they buy more than one package and give it out to their friends and family or take it to their office