First of all, we want to know why why does a wheel balance block is composed of wheel and tire rim wheel tire rim can do absolutely uniform tires have the click of a tag is usually yellow hollow circular rim and balance is relative and easy to control, no tags but have a rim will have key tag, assembly requirements as rim valve position alignment tyres tap or rim key position on the tapping position so as to reduce the wheel tyre assembly balance residue

Balance block types we ordinary balance block is divided into two kinds of an embedded and hanging a variety of paste type.

Let's see people talk on the BBS:

A big problem with clip on weights is that they often leave ugly marks/scratches on your wheels when installing/removing the weights from the wheels. I much prefer stick on weights which do not scratch wheels.

I second this. I hate using clip on weights or even seeing them on peoples wheels. I prefer stick on weights just due to the simple fact all they leave is an adhesive.

I have a carpeted table next to my balancer that each wheel gets set on after balancing where I Goo-Gone any prior weight adhesive off, and then clean the wheel, inspect wheel bearings or axles and grease if needed. A small service I do for all my customers that they really seem to appreciate - especially since most tire shops return a wheel dirty and full of fingerprints/tire lube it seems! 

I also use and prefer the K&L black, silver and chrome 1/4 oz stick on weights.

I've had the stick on ones come off ... but never had the clip-on type come off ... so I'm more in the clip-on camp ...

I prefer clip-on for dual-plane balancing, but I can only do that with single-swingarm rears on the spin balancer, so the fronts all get stick-on, single-plane balance. 
I've had them come off, but not in a while. Trick is getting wheel clean and using quality adhesive weights. 
Come to think of it, can't recall any coming unstuck since the switch from lead to steel.

what do you think about it?