Size and weight of tubes:      

size	2.25-14	2.25-16	2.25-17	2.25-18	2.25-19	2.50-14	2.50-16	2.50-17	2.50-18	2.75-10	2.75-14
weight(g)	300	310	310	320	320	320	330	350	370	320	320

size	2.75-17	2.75-18	2.75-21	3.00-10	3.00-12	3.00-14	3.00-16	3.00-17	3.00-18	3.25-16	3.25-18
weight(g)	360	370	550	330	340	390	410	440	460	480	510

size	3.50-8	3.50-10	3.50-16	3.50-17	3.50-18	3.75-12	3.75-19	4.00-8	4.00-10	4.00-12	4.00-14
weight(g)	310	350	540	560	560	500	600	360	550	600	600

size	4.50-14	5.00-10	5.00-12	90/90-18	110/90-10	110/90-16	130/90-15	120/90-10	110/90-18
weight(g)	800	650	750	560	380	680	700	680	680

1 we choose the meterials suppliers with good reputation and good quality and we'll inspect the data before the materials are into our warehouse.If the data can't meet our standard, we'll reject this kind of materias.

2 the workers will choose out the tubes with air leakage or with the holes.

3 after valcanization,we'll put air filled for 24 hours. some tubes with holes or air leakage or bad appearance will be chose out.

4 when packing, the workers will inspect the whole tubes carefully,some tubes with flaw will be chosed out. The workers will get some reward for choose the bad tubes at the last process.

5 all our equipments are new and advanced, that can keep the high quality