Designed specifically for commercial establishments such as Chunk E Cheese; McDonalds, My Gym; Schools; Daycare Centers; Doctor"s office; Indoor Playground and Gyms; etc. For home use, we recommended the standard home grade balls, which can be ordering thru separate Amazon product listings by search using keywords: " my square deals home ball offers " or simply use the following url/web address: " http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Dtoys-and-games&field-keywords=my+square+deals+home+ball+offers ". * Manufactured with Phthalate Free; Lead Free, non-PVC, 100% virgin(non-recycled) PE Plastic Materials, 3.1" diameter (meet US Government Small Parts Regulations for kids 3 years and under) in 5 bright colors. These balls were fully compliance with all applicable US children"s Toy Safety Standards. Larger 3.1" balls also provide you twice the volume/mass as the 65mm(2.5") balls, and 60% larger volume/mass than the 70mm(2.75") balls. These 3.1" balls would save you money overall (please refer to chart provided)! * Heavy duty construction to withstand abuses, even in a more demanding commercial environment. Using a unique 2-stage blow molding process to ensure consistency in quality (thickness; weight; color & firmness); smooth seam & surface. Re-enforced seam & extra thick wall construction to ensure each ball will withstand over 150 pounds of body weight against cracks; crushes & deformations. Test to withstand over 10,000 compressions to 60% of its original size (based on diameter), these balls would expect to last twice the life expectancy of the home grade balls. * Individually date-coded to ensure quality & warranty tracking. 90 Days Replacement Warranty! 100% Guaranteed against Crushing (Denting is normal, will return back to original shape), Cracking & Deformation. Designed & Made in China & proudly sold in the USA. These balls were 50% more durable than equivalent domestic made balls at 40% lower overall cost. Due to large size & volume, all ball pit balls were shipping by volume, not by actual weight( refer to as Dimensional Weight ). For larger quantity requirement, please contact seller to make alternative shipping arrangement. * Pack of 500 commercial balls in ship-ready packaging. Each pack of 500 balls will fill approximate 8.0 cubic feet of volume. Other quantity available offering thru separately Amazon product listings, please search on Amazon website using keywords " my square deals commercial ball offers ", or simply using the following url/web address: " http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Dtoys-and-games&field-keywords=my+square+deals+commercial+ball+offers ". Please contact seller if you have any additional questions.