Tilda Paper Piece Balls Biconvex £5.90 Quantity: at £5.90 each Add To Basket Patchwork Paper pieces Balls, pre-cut card templates for patchwork balls. Instructions included. Biconvex, 120 pcs (8.75 & 12.5 cm) for 20 balls, 10 of each. Enough for 20 balls in two different sizes, 10 of each. Please note fabric is not included.