They are sturdy and they wont flex or break while cleaning. They also come loose while just walking. Works like expensive but at cheap price. The seal (i. Nachtrag:Nachdem ich nun meinen schönen Tag hatte, muss ich sagen das die Schuhe seeehr bequem waren. Shelf made of pressed board but until I find similar style and weight of new scratcher, this is a quick fix. No he tenido problemas de desemparejamiento, solo alguno que otro salto por conectividad pero no es molesto. The stereo quality we experience is such a pleasure! They last; they accommodate your feet as if you were walking bare feet, but with just the necessary softness. It is magnetic so I can see how the price is warranted given its intelligent design.