Unicellular polyethylene foam, flexible; item consist of 6 cushion rings fscm 18876 p/n 13170610-1; 20 spacers fscm 18876 p/n 13170610-2; the rings andspacers are bonded together with adhesive material per meg0102100001; item has an height of 21.50 in.; an diameter of 25.50 in;