I like the softness of the exterior ball and the size is just right for knee exercises. I would recommend this product!This came with plastic tips and tools for which there was no explanation in the instruction sheet. In fact the only plug I needed was already inserted in the ball. I just had to pop it out and add enough air to cause a coronary if unaided. The order screen didn't say it came with an inflator and it didn't. People had told me these come with inflators, it just didn't happen for me. I do have a three gallon electric Sears Craftsman air compressor that can fill my automobile tires quickly, it can also drive nails and staples. It can even fill a high tech bicycle tire to 90 pounds in a few seconds. Unfortunately this huge ball doesn't need "pounds" of air pressure, it needs a lot of volume of air at a very low pressure. So with my Craftsman it took probably five minutes to reach that volume at a very low pressure. When it was all said and done I have a fine ball helping me with some therapy. I believe the material and the welds are strong. I do recommend you pay attention to the instruction NOT to fill it full on day-one, which I certainly could have done. It's very sensible to almost fill it on day-one (and let it get used to that) and then reasonably finish it off the next day or after. Do that and for you "The Big Bang Theory" will just be the name of another TV sitcom. Mine didn't blow because I followed the instructions. As for these extra white plastic parts, I have no idea what they are for.I ordered the CanDo Non-Slip Vinyl Inflatable Exercise Ball, Lime Green, 59.1" (30-1808). The packaging was perfect, in a double box. However, I received a green color that was different from the color in the product description.The lime green in the product description and the lime green in that picture are incorrect.This is a wonderful round ball. It’s a very nice shade of blue, which adds to the majesty of this round blue ball!Perfect size for under 2 years and up to 3/4yrs. Great addition to our PT clinicEs pequeño pero resistentehave had this ball for 3 years now and couldn't live without it! Used as an excersize ball (it's intended purpose) and chair, but also use as a therapy ball for my autistic son. It is more 'elastic' for a lack of better words than a lot of the excersize balls we've purchased, which makes it great for therapy uses. We roll it over my son, bounce it on him and him on it. He stands and jumps, sits and balances to build core strength, sits with me as I bounce (adding extra excersize for mom and sensory stimulation for him - very calming). Before I got our first one I thought it would just sit in the corner collecting dog hair, but I was soo wrong. We use it almost daily (for three years - that's saying something about the quality of the ball!) and it actually doesn't collect hair like I thought it would. It has been so well used that we've purchased another one for nana's house, but she's decided she's taking it to work so we're going to get yet another one! The quality and feel of this is the reason that I'm not even trying a different brand - I have 3 others and everyone (kids and adults alike) agree this is the best.No plug includedIt's a nice quality ball and a great colour (deep yellow) but it is a real effort to pump it up sufficiently to get the creases out and have it fully inflated. I nearly gave up and sent it back. The bung is OK but hard to get in properly and it sticks out a bit even when it is in. It's then really hard to get out and I fear breaking the valve. Would be better with the addition of a non-return valve (because it deflates quite a bit in between removing the pump and inserting the bung) but I suppose that might be an unreasonable expectation for this money.I bought this after being advised to use one in a home exercise routine.It was easy to inflate (normally I have to ask my husband to do these things!) and is perfect for what I need it for.The quality is good and it doesn’t deflate easily.really pleased with this gym ball, very good quality and quite bouncy which is great if you want a general use fun ball as-well, highly recommendThis ball is massive and super bouncy! Its absloutely great, love itServes its purpose.