I agree they look just like the ones that came with some fastrax tyres I bought to test on our dirt track.
They were disappointing as they didn't fit the tyre to well,they were smaller once wheel tyre and insert were all together they felt horrible
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Dave
www.norfolkbuggyclub.moonfruit.com
kyosho optima,Bosscat,Boomerang,,RB5 Vega,RB7,,RC12 5.2, TLR22-4,MP9,HB807T
Flask of tea & a rollup
Anglia model centre & CT Models
http://www.oople.com/forums/showthread.php?t=28117