They allow you to convert the  traditional chairs (with a back hip position) to chairs suitable for musicians (medial-anterior hip position), raising the hind legs. Each cue has 2 positions:  the upper face raises the legs 3  cm and face  lower raises the legs 2.5  cm.  The diameter of the circumference to house the legs is 5 cm .  You can buy them  making a bank transfer to the account number ES27 1465 0100 9617 0944 7274 or pay by Pay-pal.

They are priced at:

€ 10 a pair + € 5 certified shipping costs

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€ 20 two pairs + € 5 certified shipping costs

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Orders to: musicosylesiones@gmail.com