1.Knit 27 stitches in 110 rows for the 250 mm styrofoam ring. Depending on how firm or loose you prefer to knit, you might need to adjust this, to make sure your knitted sleeve fits the ring. Here, we’ve used a loose knit on 4mm needles. Just knit straight, until it fits around the ring. 
2.Graft the ends to form a ring. Place your styrofoam ring in your sleeve and graft the sleeve shut. 
3.You can decorate your ring with embroidery, using the same yarn and a blunt embroidery needle.
