about 1 16 34 spacing such as 1 32 34 intervals of course the closer the lines are together the closer the film can be sized to the desired size one side of the film 10 i e the underside 19 can have an adhesive on the surface thereof e g a pressure sensitive adhesive or a water based adhesive permitting the material 10 to be secured e g by contact to a surface such adhesives are known to the art an example of a suitable adhesive is resyn seal 33 2066 sold by the national adhesive company it may be diluted with water to apply at a rate of 3 5 to 4 0 pounds per ream in the commercial practice of the invention a particularly preferred composition would consist of about 50 60 by weight low density polyethylene and about 40 50 by weight caco 3 one composition actually made which exhibited excellent tear characteristics in both directions good tensile strength and resistance to aging consisted of a mixture of 50 by weight low density polyethylene with 50 by weight caco 3 the average particle size of the caco 3 was 12 microns other materials such as pigments may be added to the composition the pattern of cross tear lines in the sheet material 10 is formed by embossing a plastic film with embossing rolls a preferred technique for producing the embossed cross tear lines according to this invention employs a slot die extrusion method wherein the plastic material with its second phase constituent is heated to a temperature of about 400 u00b0 f and then introduced into the nip formed by the contact between a metal embossing roll engraved with a raised regular pattern of perpendicularly intersecting lines and a hard rubber.