50PCS/Lot 13*21cm Kraft Paper Bubble Envelopes Bags

The seal length is 4cm ,the double edge is 1+1=2cm
so when you order size such as 13x21cm. means total size is 13x21cm+4cm
( the the double side cut kerf will with 2-5mm error for machine cutting,it is normal )
and inside width is 13-2cm=11cm.inner length is 21cm

Quality: good quality, waterproof