Specification Brand : ThreaDelight BulletPoint1 : Prewound Embroidery Bobbins BulletPoint2 : 100% Filiment Polyester BulletPoint3 : Black BulletPoint4 : 60 WT BulletPoint5 : 125 yards per bobbin CareInstructions : Machine Wash Color : Black ItemName : 72 Prewound Bobbins - Black "L" Size Cardboard Sided ItemPackageDimensions_Height : 2 inches ItemPackageDimensions_Length : 8 inches ItemPackageDimensions_Width : 3 inches ItemTypeKeyword : machine-embroidery-thread Manufacturer : ThreaDelight Material : Polyester PartNumber : 872 ProductDescription : Black prewound bobbins, cardboard sided, with plastic core. 125 yards of premium quality poly filament thread on each bobbin. L size - universal for most embroidery machines. Good prewound bobbins are wound by high tech machines which provide a smooth, uniform wind. The result is much more thread on the bobbin than a self-wound bobbin. Difference between plastic sided and cardboard sided bobbins: Plastic bobbins are reusable; cardboard bobbins are disposable. Some machines, especially Pfaff (2124, 2170, 2140), work better with the cardboard-sided bobbins. Cardboard sides provide more friction and backlash is usually not an issue. If it is, the bobbin tension may need to be tightened. ProductSiteLaunchDate : 2010-08-08T07:00:00.000Z TargetAudienceKeyword1 : seniors TargetAudienceKeyword2 : men TargetAudienceKeyword3 : women UnspscCode : 60120000