The Original Slug Copper Rings Form A Physical Barrier Around Plants And Also Gives Slugs An Unpleasant Shock-like Sensation When They Try And Cross Or Climb The Copper, Caused By A Reaction Between The Metal And The Mucus They Rely On To Move. these Quality Copper Rings Have A Rolled Top Edge For Easily Handling, Are Easy To Clip Together To Form A Reliable Barrier And Will Last For Years Slowly Weathering To A Dull Finish, But Remaining Just As Effective.the Slug Copper Rings Are Supplied In A Pack Of 6 Which Fit Inside Each Other Ranging From 17cm To 18cm Diameter. large Rings Measure From 17cm To 18cm Across And 5cm Highsupplied As A Pack Of 6rolled Top Edge For Easy Handlingslug Copper Rings Form A Physical Barrier Round The Plantshock-like Sensation Deters The Slug Should It Attempt To Scale The Copperrings Pull Apart To Enable Them To Be Removed From Climbers Or Bushy Plantswhen Applying, Ensure That The Area Is Free From Slugs And That No Leaves Are Touching The Surrounding Soilcopper Will Dull Quickly After Handling And Exposure To Weatherweathered Slug Copper Rings Turn A Brown Colour And Blend With The Soildiscoloured Ring Does Not Affect Performanceextra Value Saver On Large Twin Packs - Save 3