Galebreaker Sila-Cover Silage Sheet 300 gsm – Choice of 5 Sizes up to 300 sq Metres! Galebreaker’s silage sheets are made from extremely strong 300g/m² woven polyethylene material. The edges are hemmed and the sheets have bag-fixing loops woven into the fabric ready to easily accept the hooks for Galebreaker’s silage bags. The material is …