I. Very effective and tested to IS 9167 (1979) and IS 6229 (1980). II. Most durable can be reused for 6 months. III. Made of soft, pliable and sturdy synthetic rubber. IV. Withstands temperature from -25 deg. C. to 100 deg. C. V. Very light in weight. VI. Most comfortable as it has smooth surface. VII. Std. size: Fits all. VIII. Non-allergenic and non-toxic. IX. Reflects sound waves very effectively. X. Packed very attractively with reusable container. XI. Colours: Blue Orange, (visible as well as concealed look.) Â