Gefen Sports needs to know the brand name, model, head size, string pattern, number of holes on the top part, sides and bottom and grommet colour. Each racket has a unique grommet therefore Gefen Sports needs to know all these details. Head, Dunlop, Prince, Tecnifibre and other brands £10.00 Wilson tennis and squash grommet set £12.00. Yonex tennis grommet set £12.00. Tennis and squash single grommet sets in black available as follows: 7 D - 3.1x35mm, 20 grooved in set £3.50. 8 A - 3.8x20mm, 50 lay flat in set for £5.00.10 C - 3.4x35mm, 20 grooved in set £3.50.13 A - 3.7x15mm, 100 grooved in set £7.00. 13 C - 3.7x35mm, 20 grooved in set £3.50. 16 A - 4.0x15mm, 100 grooved in set £7.00.16 C - 4.0x35mm, 20 grooved in set £3.50.19 A - 4.3x15mm, 100 in set ££7.00. 19 C - 4.3x35mm, 20 grooved in set £3.50. 23 B - 4.7x35mm 20 in set ££3.50.