Universal Stylus DIY Projects: Materials, Dimensions, and iPad/iPhone Compatibility

I am an  engineer in the field of universal stylus for pens. I am always making projects for universal stylus at home after work. In recent days, I spent 3 hours making the project, bwt  I am going to study a program called how I  can learn universal stylus for pens at home. 
Here are my projects:About my program:Length:5.5"(140mm)
Pen tube diameter 0.35"(9.5mm)
Disc diameter: 0.27" (6.8mm)(2mm rubber point)
Fiber tip Diameter:0.24 (6mm)
Weight: 24g
Material: Stainless steel, Aluminum
First  of all, you need to prepare a pen, and on the  other hand you need to consider that the universal stylus for pens can not be touched on the ipad or iphone as it needs to form an electrical circle. 
It  is very easy to use and there is no worries for touching the ipad or iphone, in this way, the surface of the ipad or iphone will be dirty. 
What do you think of my project ? Any of your ideas would be highly appreciated.
Are you interested ? 

Hi Mike-What makes your styluses different from the thousands(?) of very inexpensive ones already available?If you're out to make money, I think you're going to have a very hard time unless you have a unique feature that makes your stylus better than all of the others.  If you just want to learn about styluses, buy a handful at a local flea market or on eBay and take them apart.-Rick

Hi Rick,thanks for your comment. I think my universal stylus for pens is considerably  different from others though mine is not the most expensive among those as mine is of best quality in MEKO on Amazon. If you don't agree, please see the link.any other questions, please  feel  free to contact us. many thanks

hi Rick,Thanks for your question. That is a good question you asked.As to this question, this model is of 2nd fiber disc pen, considerably different from those in the retailing shop or on Amazon.Here are the answers below:1. both two ends are protected when using2. the diameter of the grip is increased, that  is, flexibility.3. the quality of the pen is thinner and more comfortable when using.4. when it is using dirty, the pen can be disassembled to rewash again.
Hope that it can solve your question. 

dear all,thanks for your ideas. that model is Asin: B074847T3T(MEKO) on Amazon.For more information about this item, please see the link: https://www.amazon.com/MEKO-Generation-Precision-Capacitive-Replacement/dp/B074847T3T/ref=sr_1_2?s=electronics&ie=UTF8&qid=1522029586&sr=1-2&keywords=MEKO.After buying it, I have tried it for several times and it works very well. So today I would like to recommend it to anyone looking for a best universal stylus for pens on Amazon. It suits for every model of ipad or iphone.Any other questions, please reply me at any time.Please don't hesitate to buy if you need it.many thanks

hi Rick,do you agree with my ideas ? what do you think ?many thanks