7hpi Plastic Canvas - Oval Sheets (18 ratings) £2.00 Quantity: at £2.00 each 2 in stock. Plastic canvas is ideal for children or crafters who find it difficult holding an embroidery frame etc. This oval shape is perfect for making unique table mats - use A4 or A3 sheets to make matching coasters. It is a clear, gridded stiff plastic mesh. Use wool to stitch your design and be creative. Oval sheets 7hpi - ie 7 holes per inch Size 12in x 18in. Manufactured by Darice.