Gas fin plugs?

Just got quoted a great price on ten sets of these plugs and was just wondering if anyone else has tried them,they are the same as fcs with the side grooves. 

They come in transparent colours aswell as normal black or white. Cheers people!

p.s il try and post a link  when im on my laptop

let me know wot u think, i was also keen to try the coloured plugs, i’,ve seen the fins they look good, lowwen 88 on the gold coast australia uses them.

I use the black plastic ones in ding repairs, they are  as good as the FCS original. Have had none come back broken yet.