Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: How sturdy/stable are these? King frame, 2 people, kids occasionally "jump" in with us... do the frame legs break through the plastic? Is it whobbly?
Document: I have a 4-poster bed, and needed some lifts. I have a California King, so I needed 6, so had to buy 2 sets. Still, I only paid a total of $15 I think. They are extremely hard plastic, and each one holds the wheels of the bed frame. I have a bed skirt on, so you can't see them, but they raise the bed beautifully! It is exactly what I wanted and I am so happy I was able to do it so inexpensively.
Many Queen and King sized beds have one or two extra legs in the center of the frame. Anyone out there make em like that?
If u have a king bed you will need to buy two kits! King beds if it is like my frame have 6 support legs. Using four will cause ur bed to droop terribly in the center. I gave this the rating of me liking it because I do but would of been nice for them to advise or have a kit for king beds. I'm not usually inspecting my frame which I will take full responsibility for. If you are like me... Look at frame prior to ordering any accessories.
Our neighbors gave us a bed frame that was unusually low. The bedding didn't fit and I worried that anyone disabled or elderly would have problems getting out of the bed. It is now a normal height.
These were put on my bed and the next day I was in bed sick my daughter came in to sit on the edge to talk to me and with a huge crash the middle of the riser burst thru the thin plastic and the leg hit the floor going thru the riser. My daughter isn't fat and maybe between us it's 230 lbs but these were a complete waste of money! I just bought solid wood risers for the same price! Those I KNOW WILL LAST!
I bought these and some other once that where a little more expensive because I have a king size bed and need 6 of them. But to be truthful I cannot tell the different in those and the other once. They work great....I do recommend those if your looking for something sturdy
These are sturdy risers which we used to raise our bed. At our age getting in and out of bed was difficult until we placed these risers under the legs. They were an excellent choice and easy to deal with.
These would be a great gift for a student living in a small room where space is at a premium. The product is well crafted of sturdy polymer type plastic. Considering price, product is a great value.
Great price and value. Bed legs fit securely into top of stands.
UPDATE (7/7/14): Broke two more over the span of two days. These are not worth it. Spend a few more bucks for better quality bed risers that won't collapse when there's 250 lbs of people sleeping on your bed.UPDATE (11/20/13): Replacement is working just fine. I'm happy with these risers!NOTE: Green Home has kindly sent me a replacement at no extra cost. I will update in a month on the status of the product then.These bed risers seemed quite sturdy and gave me no problems the first month.
Answer: We have a queen bed but have not had any problem with wobble. We love them. I recommend you try them.