... 3,Washable,For cloth 4,Durable. Sewing Magnet with PVC Properties of this style round magnets:Material: ... Tile, Horseshoe,Arc slot, Block with concave holes,Disc with concave holes, Tile with concave holes,Disc with countersink,Trapezoid,Outer annuluses star,Benched ... sintering"2.We have lots of advanced machining lines with more than 3000 machines for operation. manufacturing micro-miniature ...