Ball Pits are sewn with tight stitching and Anti pill fleece and or Blizzard fleece is used. The lining is Uhaul pads to help keep the shape of the ball pit. Ball pits are 10x10 and come with 3mm colored chain to hang in your sugar gliders cage. There are several charms hanging off the chain for enrichment for your sugar gliders. I use ping pong balls in my ball pits and those are not included with the purchase of a ball pit but I do sell them separate so please check out my other listings. Thank you for choosing our Original Ball pit for your sugar gliders. "Note" Ball pits can be sewn in fabric located in my other listings with the glider gyms.